The ksp of yttrium fluoride, yf3, is 8. 62 × 10-21. Calculate the molar solubility of this compound

When, a 20.0 ml of 0.20 m HNO₃ was titrated with 10.0 ml of 0.20 m NaOH. Then, the pH of the resulting solution is approximately 1.18.

To determine the pH of the solution resulting from the titration of 20.0 mL of 0.20 M HNO₃ with 10.0 mL of 0.20 M NaOH, we need to calculate the concentration of the resulting solution and then find the pH using the appropriate equations.

Let's start by calculating the moles of HNO₃ and NaOH used in the titration:

Moles of HNO₃ = concentration of HNO₃ × volume of HNO₃ used

= 0.20 mol/L × 0.0200 L

= 0.0040 mol

Moles of NaOH = concentration of NaOH × volume of NaOH used

= 0.20 mol/L × 0.0100 L

= 0.0020 mol

Since HNO₃ and NaOH have a 1:1 stoichiometric ratio, the moles of HNO₃ remaining after the reaction are:

Moles of HNO₃ remaining = Moles of HNO₃ initial - Moles  of NaOH used

= 0.0040 mol - 0.0020 mol

= 0.0020 mol

Now, let's calculate the new concentration of HNO₃ in the resulting solution:

Concentration of HNO₃ = Moles of HNO₃ remaining / Total volume of resulting solution

= 0.0020 mol / (20.0 mL + 10.0 mL) = 0.0020 mol / 0.0300 L

= 0.067 M

To find the pH of the resulting solution, we can use the fact that HNO₃ is a strong acid and completely dissociates in water. Therefore, the concentration of H⁺ ions in the solution is equal to the concentration of HNO₃;

[H⁺] = 0.067 M

Now, we can calculate the pH;

pH = -log10([H⁺])

= -log10(0.067)

≈ 1.18

Therefore, the pH of the resulting solution is approximately 1.18 (rounded to the appropriate number of significant figures).

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Answer:

1.06L = V₂

Explanation:

Charle's Law states that the volume of a gas is directly proportional to the absolute temperature when pressure remains constant.

The equation is:

V₁T₂ = V₂T₁

Where V is volume and T absolute temperature of 1, initial state and 2, final state of the gas.

V₁ = 1.83L

T₂ = -100°C + 273.15 = 173.15K

V₂ = ?

T₁ = 27°C + 273.15 = 300.15K

V₁T₂ = V₂T₁

1.83L*173.15K = V₂*300.15K

Increasing the temperature will cause the equilibrium to shift towards the products, favoring the formation of more iodine atoms (I(g)). Decreasing the temperature will cause the equilibrium to shift towards the reactants, favoring the reformation of iodine molecules (I2(g)).

a) Increasing the temperature:

The equilibrium will shift towards the products.

In an endothermic reaction, increasing the temperature can be considered as adding energy to the system.

According to Le Chatelier's principle, when the temperature is increased, the equilibrium will shift in the direction that absorbs or consumes heat to counteract the temperature rise.

In this case, since the reaction is endothermic (absorbs heat), the forward reaction is favored.

The balanced equation for the reaction is:

I2(g) ⇌ 2I(g)

When the temperature is increased, the system will try to counteract the temperature rise by favoring the reaction that absorbs heat. In this case, the forward reaction is the one that absorbs heat (endothermic). Therefore, the equilibrium will shift towards the products (2I(g)) to consume the excess heat.

Increasing the temperature will cause the equilibrium to shift towards the products, favoring the formation of more iodine atoms (I(g)).

b) Decreasing the temperature:

The equilibrium will shift towards the reactants.

In an endothermic reaction, decreasing the temperature can be considered as removing energy from the system.

According to Le Chatelier's principle, when the temperature is decreased, the equilibrium will shift in the direction that releases heat to counteract the temperature drop.

In this case, since the reaction is endothermic (absorbs heat), the reverse reaction is favored.

The balanced equation for the reaction is:

I2(g) ⇌ 2I(g)

When the temperature is decreased, the system will try to counteract the temperature drop by favoring the reaction that releases heat.

In this case, the reverse reaction is the one that releases heat (exothermic). Therefore, the equilibrium will shift towards the reactants (I2(g)) to generate more heat.

Decreasing the temperature will cause the equilibrium to shift towards the reactants, favoring the reformation of iodine molecules (I2(g)).

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The reaction of 1,3-cyclohexadiene and maleic acid (cis-2-butenedioic acid) leads to the formation of a cycloadduct known as a Diels-Alder adduct. The structure of the product is a cyclohexene ring fused with a carboxylic acid group.

The Diels-Alder reaction is a powerful organic transformation that involves the reaction of a conjugated diene (such as 1,3-cyclohexadiene) with a dienophile (such as maleic acid). In this reaction, the diene acts as a nucleophile and attacks the electron-deficient dienophile, resulting in the formation of a cyclic product.

When 1,3-cyclohexadiene reacts with maleic acid, the diene's double bonds undergo cycloaddition with the double bonds of maleic acid, forming a new six-membered ring. The resulting product is a cyclohexene ring fused with a carboxylic acid group. The stereochemistry of the product depends on the orientation of the dienophile. In the case of cis-2-butenedioic acid (maleic acid), the product would have a cis configuration.

The exact structure of the product would require more specific information about the reaction conditions and any other substituents present. However, based on the reactants provided, the reaction of 1,3-cyclohexadiene and maleic acid would yield a Diels-Alder adduct, consisting of a fused cyclohexene ring and a carboxylic acid group in a cis configuration.

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Answer:

The correct answer is Choice D.

(Headaches or backaches)​

Explanation:

Hope this helps!

Please mark me as Brainlinieast.

A gas expands in volume from 29.3 mL to 80.1 mL at constant temperature.

(a)  The work done (in joules) if the gas expands against a vacuum is 0.

(b) The work done (in joules) against a constant pressure of 3.5 atm is -12.7 J.

(c) The work done (in joules) against a constant pressure of 10.1 atm is -36.6 J.

To calculate the work done during the expansion of a gas, we can use the formula:

Work (W) = -PΔV

Where P is the pressure and ΔV is the change in volume.

(a) If the gas expands against a vacuum, it means there is no external pressure opposing the expansion. In this case, the work done is zero because there is no pressure acting against the gas.

W = 0 (no work done against a vacuum)

(b) If the gas expands against a constant pressure of 3.5 atm, we need to convert the pressure to SI units (Pascals) before calculating the work.

Given:

Initial volume (V1) = 29.3 mL = 29.3 × 10⁻⁶L

Final volume (V2) = 80.1 mL = 80.1 × 10⁻⁶ L

Pressure (P) = 3.5 atm = 3.5 × 101325 Pa

ΔV = V2 - V1 = (80.1 × 10⁻⁶ L) - (29.3 × 10⁻⁶ L)

W = -PΔV = -(3.5 × 101325 Pa) × [(80.1 - 29.3) × 10⁻⁶) L]

W ≈ -12.7 J.

Therefore, the work done against a constant pressure of 3.5 atm is approximately -12.7 J.

(c) Similarly, for a constant pressure of 10.1 atm:

Pressure (P) = 10.1 atm = 10.1 × 101325 Pa

ΔV = V2 - V1 = (80.1 × 10⁻⁶ L) - (29.3 × 10⁻⁶) L)

W = -PΔV = -(10.1 × 101325 Pa) × [(80.1 - 29.3) × 10⁻⁶L]

W ≈ -36.6 J.

Therefore, the work done against a constant pressure of 10.1 atm is approximately -36.6 J.

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Answer:

experiments

Explanation:

I am not sure but heres my take

Answer:

It was only after the invention of electron microscope that the idea developed

The ionization energy of an atom is the amount of energy required to completely remove an electron from its ground state. In the case of a hydrogen atom in a state with quantum number n, the ionization energy is given by the following equation: Ionization energy = -13.6 eV / n^2

For a hydrogen atom in a state with quantum number n=3, the ionization energy can be calculated as follows:

Ionization energy = -13.6 eV / 3^2 = -13.6 eV / 9 = -1.51 eV

The negative sign indicates that energy is required to remove the electron. Therefore, the largest possible ionization energy of the atom in this state is 1.51 eV.

In the quantum mechanical description, the ionization energy of a hydrogen atom is given by the formula:

Ionization Energy (IE) = -13.6 eV * (1/n²)

where n is the principal quantum number. In this case, n = 3.

IE = -13.6 eV * (1/3²) = -13.6 eV * (1/9) = -1.51 eV

Since the ionization energy is negative, the largest possible ionization energy is the least negative value. Therefore, the answer is (b) 1.51 eV.

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Explanation:

The balanced half-reaction for the reduction of nitrate, NO, (aq), to nitrogen gas, N.(g), in a basic solution is given below:Balanced half-reaction equationNO₃¯ → N2(g)

Step 1: Write the half-reaction equation and balance it without adding water or H⁺ or OH⁻.NO₃¯ → N2(g)

Step 2: Add water to the right-hand side of the equation to balance the oxygen.NO₃¯ → N2(g) + H2O

Step 3: Add sufficient H⁺ ions to balance the hydrogen.NO₃¯ + 10H⁺ → N2(g) + 5H2O

Step 4: Add electrons (e⁻) to balance the charges.NO₃¯ + 10H⁺ + 8e⁻ → N2(g) + 5H2OThe half-reaction for the reduction of nitrate, NO, (aq), to nitrogen gas, N.(g), in a basic solution is given by NO₃¯ + 10H⁺ + 8e⁻ → N2(g) + 5H2O.

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Answer:

100% efficiency, this could only happen if there was not any friction Simple Machines Inclined plane, wedge, screw, lever, pulley and wheel and axel they are the most basic devices for making work easier

Explanation:

Experimental errors or variations can significantly impact the results of the experiment. In this case, inadequate stirring, incomplete mixing of layers, incorrect extraction solution, and improper pH measurement can lead to inaccurate component percentages in the final product.

(a) Inadequate stirring or shaking of the mixture after adding DCM to Pan acetin can result in incomplete dissolution or extraction of certain components. This would lead to lower percentages of the components that require proper mixing for their extraction.

(b) Failure to thoroughly mix the aqueous and organic layers during the NaOH extraction can cause incomplete transfer of target components from one layer to another. As a result, the percentages of the desired components may be lower than expected, indicating incomplete extraction.

(c) Mistakenly using 5% HCL instead of 5% NaOH for the DCM extraction can affect the selectivity of the extraction process. Different solvents have varying affinities for specific components, so using the wrong extraction solution can lead to incorrect percentages of the components in the final product.

(d) Instead of using pH paper, if litmus paper is used to neutralize the [tex]NaHCO_{3}[/tex] solution to pH 7, the accuracy of pH measurement may be compromised. Litmus paper provides a visual color change indication but lacks the precision of pH paper. As a result, the pH adjustment may not be accurate, potentially leading to deviations in the final component percentages.

In summary, these experimental errors or variations can introduce inaccuracies in the component percentages of the final product due to inadequate mixing, incorrect extraction solution, and imprecise pH measurement. It is essential to carefully follow the experimental procedure to minimize such errors and ensure reliable results.

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Answer:

C

Explanation:

Boyle's law states that "the volume of a given mass of gas is inversely proportional to its pressure at constant temperature."

Inverse proportionality means that as one quantity is increasing, the other quantity is decreasing and vice versa.

Hence, as the pressure was increased, the volume decreases accordingly in obedience to Boyle's law.

Answer:

What is TRUE about the missing volume is option C.

C. The volume will decrease due to inverse relationship of V & P

Explanation:

The given parameters of the gas are;

The initial pressure of the gas, P₁ = 2 atm

The initial volume of the gas, V₁ = 1.5 L

The final pressure of the gas, P₂ = 2 atm

Boyle's law states that, at constant temperature, the volume, 'V', of a given mass is inversely proportional to its pressure, 'P';

Mathematically, Boyle's law can be expressed as follows;

P ∝ 1/V

From which we have;

P·V = Constant

∴ P₁·V₁ = P₂·V₂

For the given gas, we get;

2 atm × 1.5 L = 6 atm × V₂

∴ V₂ = 2 atm × 1.5 L/(6 atm) = 0.5 L

Therefore, the volume decreases from 1.5 L to 0.5 L.

The lime and soda ash dosages necessary for precipitation softening are 373/1000 kg/m^3 and 374/1000 kg/m^3 respectively.

Given information:

Municipality treats 15 x 10^6 gal/day of groundwater containing the following:

CO2 = 17.6mg/L,

Ca^2+ = 80 mg/L,

Mg^2+ = 48.8 mg/L,

Na^+ = 23 mg/L,

Alk(HCO3^-) = 270 mg/L

as CaCO3,

SO4^2- = 125 mg/L,

and Cl^- = 35 mg/L.

The soda ash is 90% sodium carbonate, and the lime is 85% weight CaO.

Softening by excess lime treatment needs to be determined.

Concept used:

Soda ash dosage = 1.4 (Alkalinity as CaCO3 mg/L) - 1.2 (CO2 as CaCO3 mg/L)

Lime dosage = 2.2 (Alkalinity as CaCO3 mg/L) - 1.2 (Calcium hardness as CaCO3 mg/L) - 1.7 (Magnesium hardness as CaCO3 mg/L) + 0.7 (Iron and manganese hardness as CaCO3 mg/L)

Soda ash dosage = 1.4 (Alkalinity as CaCO3 mg/L) - 1.2 (CO2 as CaCO3 mg/L)CO2 as CaCO3 mg/L

= 17.6 × (50/44) = 20 mg/L

Alkalinity as CaCO3 mg/L = 270 mg/L

Soda ash dosage

= 1.4 × 270 - 1.2 × 20

= 374 mg/L (or) 374/1000 kg/m^3

Lime dosage = 2.2 (Alkalinity as CaCO3 mg/L) - 1.2 (Calcium hardness as CaCO3 mg/L) - 1.7 (Magnesium hardness as CaCO3 mg/L) + 0.7 (Iron and manganese hardness as CaCO3 mg/L)

Calcium hardness as CaCO3 mg/L = 80 mg/L

Magnesium hardness as CaCO3 mg/L

= 48.8 × 2.5

= 122 mg/L (or) 0.122 kg/m^3

Iron and manganese hardness as CaCO3 mg/L = 0 mg/L

Lime dosage

= 2.2 × 270 - 1.2 × 80 - 1.7 × 0.122 + 0.7 × 0

= 373 mg/L (or) 373/1000 kg/m^3

Soda ash dosage required for precipitation softening = 374/1000 kg/m^3

Lime dosage required for precipitation softening = 373/1000 kg/m^3

Therefore, the lime and soda ash dosages necessary for precipitation softening are 373/1000 kg/m^3 and 374/1000 kg/m^3 respectively.

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When considering the structure for 4POC, Parallel β sheets are often found in the protein interior due to the arrangement of nonpolar amino acids on both sides of the sheet.  Thus, correct option is (A).

Option (A) is the proper conclusion. Because they are stabilized by interactions between nonpolar amino acids on both sides of the sheet, parallel sheets are frequently found inside proteins. These nonpolar residues can interact well with one another outside of an aqueous environment due to their hydrophobic nature. The protein structure is stabilized by this configuration.

Contrarily, parallel sheets with nonpolar amino acids on either one side of the sheet (option B) or on both sides of the sheet in the protein exterior (option C) are less frequent because doing so would expose hydrophobic residues unfavorably to the solvent and cause the protein to become instabilized.

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Answer:

[tex]\boxed {\boxed {\sf 0.54 \ mol \ Cl_2}}[/tex]

Explanation:

A mole is any quantity of a substance that contains 6.02 × 10²³ particles. At standard temperature and pressure, or STP, 1 mole of as is equal to 22.4 liters. This is true for any gas, regardless of the specific kind.

Although it is not specified, we can assume this gas is at STP. Let's set up a ratio using this information: 22.4 L/mol

[tex]\frac {22.4 \ L \ Cl_2}{1 \ mol \ Cl_2}[/tex]

Multiply by the given number of liters: 12

[tex]12 \ L \ Cl_2 *\frac {22.4 \ L \ Cl_2}{1 \ mol \ Cl_2}[/tex]

Flip the ratio so the liters of chlorine cancel.

[tex]12 \ L \ Cl_2 * \frac {1 \ mol \ Cl_2}{22.4 \ L \ Cl_2}[/tex]

[tex]12 * \frac {1 \ mol \ Cl_2}{22.4 }[/tex]

[tex]\frac {12}{22.4 } \ mol \ Cl_2[/tex]

[tex]0.53571428571 \ mol \ Cl_2[/tex]

The original measurement of liters has 2 significant figures, so our answer must have the same.

For the number we found, that is the hundredth place.

The 5 in the thousandth place tells us to round the 3 up to a 4.

[tex]0.54 \ mol \ Cl_2[/tex]

12 liters of chlorine gas at STP is approximately 0.54 moles of chlorine gas.

the answer is 76.01g/mol

and the density:1.4g/cm³

Answer:

metal or other acids

Explanation: hope u get it right

The rate of consumption of I- in the first 15.0 seconds of the reaction is 0.227 M/s.

The given balanced chemical equation is:

H2O2(aq) + 3I-(aq) + 2H+(aq) → I3-(aq) + 2H2O(l)

From the stoichiometry of the balanced equation, we can see that the ratio between I- and H2O2 is 3:1. This means that for every 1 mole of H2O2 reacted, 3 moles of I- are consumed.

In the given time interval of 15.0 seconds, the concentration of I- decreases from 1.000 M to 0.773 M. The change in concentration is:

Δ[I-] = [I-]final - [I-]initial = 0.773 M - 1.000 M = -0.227 M

To find the rate of consumption of I-, we divide the change in concentration by the time interval:

Rate = Δ[I-] / Δt = -0.227 M / 15.0 s = -0.0151 M/s

The negative sign indicates the decrease in concentration of I-. However, since rate values are usually reported as positive values, we take the absolute value:

Rate = 0.0151 M/s

Therefore, the rate of consumption of I- in the first 15.0 seconds of the reaction is 0.0151 M/s or approximately 0.227 M/s.

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The volume of which the stock calcium solution would you need to deliver the 8 mEg dose in the 250-mL of D5W is 2 mL

Therefore, the correct answer is A.

.In this case, CaCl₂ produces Ca₂⁺ and 2Cl⁻.So the equivalent weight of CaCl₂ is:

1Ca₂⁺ + 2Cl⁻ → 1 mol of CaCl2 has 1Ca₂⁺ and 2Cl⁻ions

Equivalent weight of CaCl₂ = Molecular weight / n

Equivalent weight of CaCl₂ = 111/ 3 = 37

The molecular weight of CaCl₂ is 111 gm/mole and n = 3 because it gives 3 ions when it dissociates in a solution.

Number of milliequivalents in 8 mmol of calcium = 8 x 2 = 16 mEq

The number of milliequivalents in the stock solution is 4 x 2 = 8 mEq/ml.

Volume of the stock calcium solution required = (16/8) x 1= 2 mL

So, the Answer: A. 2 mL.

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When 6.0 liters of [tex]C_2H_6[/tex] are combusted, the total volume of [tex]CO_2[/tex] formed at STP is approximately 12.02 liters.

To determine the total volume of [tex]CO_2[/tex] formed when 6.0 liters of [tex]C_2H_6[/tex] are combusted, we need to use the balanced chemical equation and stoichiometry.

From the balanced chemical equation:

2 [tex]C_2H_6[/tex](g) + 7 O2(g) → 4 [tex]CO_2[/tex](g) + 6 H2O(g)

We can see that the molar ratio between [tex]C_2H_6[/tex] and [tex]CO_2[/tex] is 2:4, which simplifies to 1:2. This means that for every 2 moles of [tex]C_2H_6[/tex] combusted, 4 moles of [tex]CO_2[/tex] are produced.

To solve this problem, we need to convert the given volume of [tex]C_2H_6[/tex] to moles and then use the stoichiometry to determine the volume of [tex]CO_2[/tex] produced.

Step 1: Convert volume of [tex]C_2H_6[/tex] to moles:

Using the ideal gas law, PV = nRT, at STP (Standard Temperature and Pressure), one mole of any ideal gas occupies 22.4 liters. Therefore, 6.0 liters of [tex]C_2H_6[/tex] is equal to 6.0/22.4 = 0.268 moles of [tex]C_2H_6[/tex].

Step 2: Apply stoichiometry to find moles of [tex]CO_2[/tex]:

Since the molar ratio between [tex]C_2H_6[/tex] and [tex]CO_2[/tex] is 1:2, we multiply the moles of C2H6 by the stoichiometric coefficient ratio:

0.268 moles of [tex]C_2H_6[/tex] * (4 moles [tex]CO_2[/tex] / 2 moles [tex]C_2H_6[/tex]) = 0.536 moles of CO2.

Step 3: Convert moles of [tex]CO_2[/tex] to volume:

At STP, 1 mole of any ideal gas occupies 22.4 liters. Therefore, 0.536 moles of [tex]CO_2[/tex] is equal to 0.536 * 22.4 = 12.02 liters of [tex]CO_2[/tex].

Thus, when 6.0 liters of [tex]C_2H_6[/tex] are combusted, the total volume of [tex]CO_2[/tex] formed at STP is approximately 12.02 liters.

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Answer:

a women standing in high heels

Explanation:

Answer:

A woman standing in high heels

The increasing order of reactivity of the given compounds in nucleophilic addition reactions is: Butanone < Propanone < Propanal < Ethanal

The reactivity of a carbonyl compound in nucleophilic addition reactions depends on the electron density at the carbonyl carbon. The more electron density at the carbonyl carbon, the less reactive it is towards nucleophilic attack.

In the given compounds, the electron density at the carbonyl carbon decreases with increasing number of alkyl groups. This is because alkyl groups are electron-releasing groups and they donate electrons to the carbonyl carbon.

The more alkyl groups there are, the more electrons are donated to the carbonyl carbon, and the less reactive it is towards nucleophilic attack.

Therefore, butanone, which has the fewest alkyl groups, is the most reactive towards nucleophilic attack. Propanone, which has one alkyl group, is less reactive than butanone.

Propanal, which has two alkyl groups, is less reactive than propanone. And ethanal, which has three alkyl groups, is the least reactive towards nucleophilic attack.

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Answer:

Explanation:

The new pressure can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we're finding the new pressure

[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]

We have

[tex]P_2 = \frac{27 \times 759}{11.4} = \frac{20493}{11.4} \\ = 1797.631....[/tex]

We have the final answer as

Hope this helps you

To prepare a [tex]HC_{2} H_{3}O_{2}[/tex]  buffer with a pH of 4.24 and [tex]pK_{a}[/tex] of 4.74 ,the ratio  [tex]\frac{{C_{2} H_{3} O_{2}} ^{-}}{HC_{2} H_{3} O_{2} } }[/tex] is 0.3162.

A buffer is a solution containing an acid and its conjugate base or a base and its conjugate acid .

Eg: Acidic buffer : Acetic acid and sodium acetate

     Basic buffer : Ammonium hydroxide and ammonium chloride

Buffer is used to resist changes in the pH of the solution to which it is added.

given, pH of [tex]HC_{2} H_{3}O_{2}[/tex]  = 4.24

            [tex]pK_{a}[/tex] of [tex]HC_{2} H_{3} O_{2}[/tex]  = 4.74

According to Henderson -Hasselbalch equation.

pH                 =  [tex]pK_{a}[/tex]  + log [tex]\frac{conjugate base}{acid}[/tex]

4.24               =  4.74  + log [tex]\frac{{C_{2} H_{3} O_{2}} ^{-}}{HC_{2} H_{3} O_{2} } }[/tex]

4.24 - 4.74     =  log [tex]\frac{{C_{2} H_{3} O_{2}} ^{-}}{HC_{2} H_{3} O_{2} } }[/tex]

-0.50              =   log[tex]\frac{{C_{2} H_{3} O_{2}} ^{-}}{HC_{2} H_{3} O_{2} } }[/tex]

[tex]log^{-1}[/tex](- 0.50)   =   [tex]\frac{{C_{2} H_{3} O_{2}} ^{-}}{HC_{2} H_{3} O_{2} } }[/tex]

0.3162            =  [tex]\frac{{C_{2} H_{3} O_{2}} ^{-}}{HC_{2} H_{3} O_{2} } }[/tex]

Therefore, the ratio  [tex]\frac{{C_{2} H_{3} O_{2}} ^{-}}{HC_{2} H_{3} O_{2} } }[/tex]  is 0.3162 .

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This ratio can be determined using the Henderson-Hasselbalch equation.

To prepare a HC2H3O2 buffer with a pH of 4.24 and a pKa of 4.74, calculate the ratio of [tex]C2H3O2^-[/tex](conjugate base) to HC2H3O2 (acid) that will result in the desired pH.

The Henderson-Hasselbalch equation relates the pH of a buffer solution to the pKa of the acid and the ratio of the conjugate base to the acid. It is given by:

pH = pKa + log([[tex]C2H3O2^-[/tex]]/[HC2H3O2])

In this case, the desired pH is 4.24, and the pKa of HC2H3O2 is 4.74. We can rearrange the Henderson-Hasselbalch equation to solve for the ratio [[tex]C2H3O2^-[/tex]]/[HC2H3O2]:

[C2H3O2^-]/[HC2H3O2] = 10^(pH - pKa)

Substituting the values, we have:

[[tex]C2H3O2^-[/tex]]/[HC2H3O2] = 10^(4.24 - 4.74)

Simplifying the equation and calculating the ratio, you can determine the appropriate ratio of [tex]C2H3O2^-[/tex] to HC2H3O2 needed to prepare the buffer with the desired pH of 4.24.

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The final molarity of the zinc cation from the calculation is 0.144 M

Stoichiometry is an essential tool for chemists to understand and predict the quantitative aspects of chemical reactions. It allows for precise calculations of reactant quantities, product yields, and the optimization of reaction conditions for industrial processes.

Number of moles of the zinc chloride = 4.84 g/136 g/mol

= 0.036 moles

Number of moles of potassium carbonate = 250/1000 * 0.10

= 0.025 moles

The equation of the reaction is;

ZnCl2(s) + K2CO3(aq) ----> ZnCO3(aq) + 2KCl(aq)

Final molarity of the Zinc cations = 0.036 moles * 1000/250 L

= 0.144 M

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Answer:

300

Explanation:

at least 300 molecules

In any organic redox reaction, you can recognize the reduced and oxidized organic molecules by the net change in electrons between products and reactants. Reduction corresponds to the gain of electrons, and oxidation corresponds to the loss of electrons.

The redox reactions refer to chemical reactions in which the oxidation state of atoms or molecules is altered. In organic redox reactions, one organic compound is reduced (gains electrons) while another is oxidized (loses electrons).The term 'oxidized' means that the molecule is losing electrons or increasing in oxidation state. In contrast, the term 'reduced' means that the molecule is gaining electrons or decreasing in oxidation state. In any organic redox reaction, the reduced and oxidized organic molecules can be recognized by the net change in electrons between products and reactants.The products have lower potential energy than the reactants in a spontaneous redox reaction. When electrons are transferred, energy is either released or absorbed.

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In a multistep mechanism, a complex reaction is broken down into a series of elementary steps, each involving the collision and transformation of reactant molecules. The correct answer is (b) the rate of the overall reaction is slower than the slowest step.

The overall rate of the reaction is determined by the rate of the slowest (rate-determining) step. This step limits the overall reaction rate because it takes the longest time to occur or requires the highest activation energy.

The rate of the overall reaction cannot be faster than the slowest step because the slowest step sets the maximum rate at which the reaction can proceed.

Similarly, the rate of the overall reaction is not equal to the fastest step or the average of all elementary steps. It is solely determined by the slowest step in the mechanism. The correct answer is (b) the rate of the overall reaction is slower than the slowest step.

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52.5 L of oxygen will react completely with 21 L of acetylene.

Acetylene (C₂H₂) burns in oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O) according to the balanced equation:

2 C₂H₂(g) + 5 O₂(g) → 4 CO₂(g) + 2 H₂O(g)

To solve this, we need to use the stoichiometry of the balanced equation. The ratio between acetylene and oxygen is 2:5. In other words, for every 2 moles of acetylene, we require 5 moles of oxygen.

Here, the volume of acetylene (C₂H₂) is 21 L, we can convert it to moles using the ideal gas law equation: PV = nRT. At standard temperature and pressure (STP), the molar volume of a gas is 22.4 L/mol.

21 L of C₂H₂ * (1 mol C₂H₂ / 22.4 L C₂H₂) = 0.9375 mol C₂H₂

Using the stoichiometry, we can set up a proportion to get the number of moles of oxygen:

(0.9375 mol C₂H₂) / (2 mol C₂H₂) = (x mol O₂) / (5 mol O₂)

Solving for x, the number of moles of oxygen:

x = (0.9375 mol C₂H₂ * 5 mol O₂) / (2 mol C₂H₂)

x = 2.34375 mol O₂

Finally, we can convert the number of moles of oxygen to volume using the molar volume at STP:

2.34375 mol O₂ * (22.4 L O₂ / 1 mol O₂) = 52.5 L of O₂

Therefore, 52.5 L of oxygen will react completely with 21 L of acetylene.

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False. Viscosity of a polymer is not typically measured hourly; measurements depend on specific requirements.

False. The viscosity of a polymer is not typically measured on an hourly basis. Viscosity refers to the resistance of a fluid to flow, and it is generally measured under specific conditions, such as at a particular temperature or shear rate.

The viscosity of a polymer can be influenced by various factors, including molecular weight, temperature, and shear stress.

It is more common to measure the viscosity of a polymer at specific time intervals relevant to the experiment or process being studied. The frequency of measurements depends on the specific objectives and requirements of the study.

These measurements are often recorded at regular intervals, such as daily, weekly, or at specific milestones during a polymerization process.

Therefore, the statement that the viscosity of a polymer is measured hourly is false.

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