If you want to prepare 80.0 mL of 4.00M acid ,How many mL of 12.4 M HCl are required ?

Answers

Answer 1

[tex]M_{A}V_{A}=M_{B}V_{B}\\(80.0)(4.00)=V_{B}(12.4)\\V_{B}=\frac{(80.0)(4.00)}{12.4} \approx \boxed{25.8 \text{ mL}}[/tex]

If You Want To Prepare 80.0 ML Of 4.00M Acid ,How Many ML Of 12.4 M HCl Are Required ?

Related Questions

For the reaction

2A(g)+2B(g)+C(g)⟶3G(g)+4F(g)

the initial rate data in the table was collected, where [A]0 , [B]0 , and [C]0 are the initial concentrations of A , B , and C , respectively.

Experiment [A]0 (mmol⋅L−1) [B]0 (mmol⋅L−1) [C]0 (mmol⋅L−1) Initial rate (mmol⋅L−1⋅s−1)
1 11.0. 200.0 220.0 8.80
2 22.0 200.0 165.0 17.6
3 22.0 400.0 55.0 70.4
4 11.0 200.0 110.0 8.80

Reactant A is first order reactant, Reactant B is second order reactant, and Reactant C is zero order reactant...

1. What is the overall order of the reaction ______ ???
2. Write the rate law for the reaction where is the rate constant. Rate = k___???
3. Calculate the rate constant, , and identify its units. K = ____?????
4. Determine the initial rate of the reaction when [A]0=4.87 mmol⋅L−1 , [B]0=0.184 mmol⋅L−1 , and [C]0=12.0 mmol⋅L−1 . Initial Rate = _______ mmol⋅L−1⋅s−1 ??????

Answers

The overall order of the reaction is 3 and the rate law for the reaction is rate =  [A]^n [B]^m [C]^l

How to find the Order of Reaction?

1) The order of reactant A is first order reactant because a first-order reaction can be defined as a chemical reaction in which the reaction rate is linearly dependent on the concentration of only one reactant.

The order of reactant B is second order reactant because a second order reaction is a type of chemical reaction that depends on the concentrations of one-second order reactant or two first-order reactants.

Thus, the overall order of the reaction is 3.

2) The rate law in this reaction is;

rate =  [A]^n [B]^m [C]^l

But in this question, since the reactant C is zero order, then it will be simplified to; rate = k[A][B]² .

3) When we plug in the initial concentrations of A and B, we will get the rate constant of the problem which is k = 20.

4) The initial rate when [A]0=4.87 mmol⋅L−1 , [B]0=0.184 mmol⋅L−1 , and [C]0=12.0 mmol⋅L−1 is;

Rate = 20 * 4.87 * 0.184²

Rate = 3.3

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What is the pH of a solution with a pOH of 10?

Answers

The pH of the solution is 4.

What is pH value ?

pH value is the measure of the acidity and basicity of a solution.

It measures the [H+] ion liberated by an acid when dissolved in a solution.

It has a range of 0 to 14 , where 0 to 6.9 indicates acidity , 7 represents neutral solution , More than 7 up to 14 indicates alkaline solutions.

pH value is also used to predict the completion of a reaction .

It is given in the question that

The value of pOH = 10

pH = ?

It is known that the sum of pH and pOH is equal to 14.

pH + pOH = 14

pH + 10 = 14

pH = 4

Therefore the pH of the solution is 4.

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Why we use cotton cloth to mop the floor?

Answers

Answer:

because cotton have a good absorbing quality and can absorb water more which is used to mop the floor

Explanation:

What is the molecular weight of one mole of H₂CO3?

Answers

Answer:

The molecular weight 62,03 g/mol

when energy is transferred does it increase or decrease

Answers

Answer:

About energy transfers:

Explanation:

When there is an energy transfer energy is neither created, nor destroyed. This means when that when one energy store decreases, one or more others must increase.

when we send electricity to pass through electrolysis jar we see gas bubble around both electrodes. Water electrolysis produces 46cm3 at anode.

A). What gas does it appear at each electrode?
B). What would you do to identify the gas in the test tubes at each electrode?
C). Calculate the volume of gas which appears at cathode.

Answers

A) Anode - hydrogen gas

Cathode-oxygen gas

B) Hydrogen gas - The gas burns with a pop sound

Oxygen gas - The gas rekindles a glowing splint

C) The volume of gas produced at the cathode is 23 [tex]cm^3[/tex]

What is electrolysis?

Electrolysis is the process by which electric current is passed through a substance to effect a chemical change.

The electrolysis of water produces two volumes of hydrogen at the anode and one volume of oxygen at the cathode.

The hydrogen gas burns with a pop sound. It is easily identified by this test. Also, oxygen is known to rekindle a glowing splint and this is a commonly used test for oxygen gas.

Since the ratio of hydrogen produced at the anode to oxygen produced at the cathode is 2:1 by volume; then when 23 [tex]cm^3[/tex] of oxygen is produced at the cathode, 46 [tex]cm^3[/tex]of hydrogen is produced at the anode.

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A 47-year-old man with a history of alcoholism is brought to the emergency department because he was found wandering in the streets. He appears disoriented and walks unsteadily. Physical examination shows an inability to adduct the right eye or to abduct the left eye. When asked about recent events that may have resulted in his condition, he responds with several elaborate but obviously fictitious stories. Altered activity of which of the following enzymes is most likely contributing to his symptoms?​

Answers

The altered activity of the Pyruvate dehydrogenase enzyme is most likely contributing to his symptoms.

What is Pyruvate dehydrogenase?

Pyruvate dehydrogenase is an enzyme that catalyzes the conversion of pyruvate to generate dihydrolipoamide and CO2.

This enzyme (Pyruvate dehydrogenase) is required to metabolize alcohol present in the blood.

In conclusion, the altered activity of the Pyruvate dehydrogenase enzyme is most likely contributing to his symptoms.

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Based on the following reaction, how much water is produced when oxygen react with 1 mole of C₂H8?

C₂H8 (g) + 40₂ (g) →2CO2 (g) + 4H₂O(g)​

Answers

Answer:

4 moles

Explanation:

For every mole of deuteriomethane consumed, 4 moles of water are produced.

So, the answer is 4 moles.

Given that this reaction is exothermic, what direction will the equilibrium shift when the temperature of the reaction is decreased? 3H₂(g) + N₂(g) ⇔ 2NH₃(g)

A. Left (towards the reactants)
B. Right (towards the products)
C. No Shift

Answers

Equilibrium will shift towards the products when temperature is decreased in an exothermic reaction of the  formation of ammonia.

What is an exothermic reaction?

An exothermic reaction is a reaction in which heat content of the reactants is greater than the heat content of product.

In an exothermic reaction, heat is given off.

For an exothermic reaction in equilibrium, increasing temperature shifts equilibrium to the towards the left, towards the reactants.

On the other, equilibrium will shift towards the products when temperature is decreased.

Therefore, equilibrium will shift towards the products when temperature is decreased in the reaction of the  formation of ammonia.

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What does each star on the map represent?
O location of an epicenter
O location of a focus
O location of a seismograph
O location of a wave

Answers

Each star on the map represents location of an epicenter. Thus, the correct answer is Option A.

What is an epicentre on the map?

Epicenter is defined as the point directly at the position on the Earth's surface, where the earthquake started. These are represented by the stars on the map.

Scientists use triangulation to find the epicenter of an earthquake.

When seismic data is collected from at least three different locations, it can be used to determine the epicenter by where it intersects.

Every earthquake is recorded on numerous seismographs located in different directions.

Thus, the correct answer is Option A.

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Answer: C. location of a seismograph

Explanation:

Write the complete chemical equations for production of pentanol from pentene​

Answers

Answer:

hope this helped :( got this from my friend a long time ago but still not sure if it's really correct this

What is the equilibrium constant of a reaction?
A. It is the concentrations of products multiplied by the
concentrations of reactants.
о
B. It is the number of moles of reactants subtracted from the number
of moles of products.
C. It is the ratio of the concentrations of products to the
concentrations of reactants.
D. It is the ratio of the number of moles of products to the number of
moles of reactants.

Answers

Answer:

C. It is the ratio of the concentrations of products to the

concentrations of reactants.

Explanation:

The image shows a model of a nuclear reaction. Which objects could hit other atoms, producing a chain reaction?

Answers

The objects that could hit the atoms in the model shown are neutrons.

What is a chain reaction?

A chain reaction is a reaction that is able to sustain itself. In this case, when the neutrons collide with the fissile nucleus, more neutrons are produced which collides with more fissile nuclei thereby sustaining the reaction.

Thus, the objects that could hit the atoms in the model shown are neutrons.

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A container holds a mixture of 3.01 x 1023 molecules of H₂ gas. 1.20 x 1024 molecules of CO₂ gas, and 1.50 x 10
24 molecules O₂. If the total pressure of the container is 1.00atm, what is the partial pressure of oxygen gas in
atmospheres?
O 5.00 x 10 ¹ atm
O 9.09 x 10-2 atm
O2.50 x 10 ¹ atm
O2.00 x 10-¹ atm
8 9
10 11
12 13 14
15 16 1

Answers

Answer:

.4998 atm    ( rounded to .5 atm   ) <===== not one of the answers listed

Explanation:

The partial pressure exerted by O2   is   equal to the fraction that is O2 times the pressure

1.5 / ( 1.5 + 1.2 + .301 )   * 1 atm = .4998 atm  

( 1) Are you sure it is   ONE atm pressure in the container?

(2) IS the first answer supposed to be   5 x 10^-1  atm    perhaps?

For the reaction:
H₂O(1)→ H₂O(g)
ΔΗ = 44 kJ
How much heat is required when 9.0 g of H₂O is used?

Answers

1mol H_2O requires 44kJ heat

Moles of water

Given mass/Molar mass9/181/20.5mol

Heat required

0.5(44)22kJ

As per the reaction given

Moles of H_2O=1

∆H=44kJ

Moles of water in 9g

Given mass/Molar mass9g/18g/mol0.5mol

∆H

44(0.5)22KJ

What is the heat of reaction into kJ?
H₂(g)+Br₂(g)➝2HBr(g)

Answers

see the attached file!!!

What is the pH of a solution that contains 0.0011 moles of KOH in 393 mL of solution?

Answers

The pH of a solution that contains 0.0011 moles of KOH in 393 mL of solution is 2.56. Details about pH can be found below.

How to calculate pH?

The pH of a solution can be calculated using the following expression:

pH = - log [H3O+]

However, the hydrogen concentration of the KOH solution can be calculated as follows:

concentration = 0.0011 mol ÷ 0.393 L

concentration = 2.798 × 10-³M

The pH of KOH = - log [2.798 × 10-³M]

pH = 2.56

Therefore, the pH of a solution that contains 0.0011 moles of KOH in 393 mL of solution is 2.56.

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The bright coloring of the skin of this poison dart frog announces, "Don't eat me! My
skin is poisonous."
This is an example of an adaptation that meets the challenge of...
maintaining structure
reproduction.
getting and using energy

Answers

Getting and using energy

Determine the mass of hydrogen gas collected in a container if the gas occupies
44.8 L at STP.

Answers

Answer:

Hope this helps kinda got confused mid way

Explanation:

So the hydrogen sulphide is H2S for the molecular formula. Then the mass of hydrogen sulphide would be 1×2+32= 34g/mol At STP.

PLEASE HELP!!!!!!!
In an experiment, the molar mass of the compound was determined to be 118.084 g/mol. What is the molecular formula of the compound?

Answers

Succinic acid most probably

C_4H_6O_4

Lets see why?

The molar mass is given as 118.084g/mol

Decimal next place i.e 10th place contains 0 means it has OH bonds in most of the cases.

So it's a hydrocarbon and more closely an alcohol or aldehyde

Let's verify

4(12)+6(1)+16(4)64+48+670+58118g/mol

Approximately equal

A The weak base ionization constant (Kb) for CH3NH2 is equal to: B [CH3NH3+][OH-] [CH3NH₂] [CH3NH3 +][OH [CH3NH2][N2 O]​

Answers

The weak base ionization constant (Kb) for [tex]CH_3NH_2[/tex] is equal to

[tex]Kb = [CH_3NH^{3+}] [OH^-] / [CH_3NH_2][/tex]

What is Kb?

Kb is the base dissociation constant.

The expression for the equilibrium constant, Kb is simply the ratio of the concentration of the products raised to their coefficient to the concentration of the reactants raised to their coefficient.

[tex]CH_3NH_2(aq) + H_2O(l)[/tex]  → [tex]CH_3NH^{3+}(aq) + OH^- (aq)[/tex]

Thus, the expression for the equilibrium constant, Kb fo the above reaction can be written as follow:

[tex]Kb = [CH_3NH^{3+}] [OH^-] / [CH_3NH_2][/tex]

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How many moles of a gas can be contained in a 1600-cm° flask at 25°C and 75 kPa?

Answers

Volume=1600cm³=1.6dm³=1.6L

Temperature=25°C=273+25=298K

Pressure=75000Pa

Now

Apply ideal gas equation

PV=nRTn=PV/RTn=75000(1.6)/8.314(298)n=48.43mol

The number of moles needed is

n=48.43mol.

Calculations

Given the values of the volume and temperature, we would convert them to the required units.

Volume=1600cm³=1.6dm³=1.6L

Temperature=25°C=273+25=298K

Pressure=75000Pa

We would use the ideal gas equation

PV=nRT

n=PV/RT

n=75000(1.6)/8.314(298)

n=48.43mol

Which of the following items represents a chemical change?

melting
evaporation
freezing
burning

Answers

Burning is a chemical reaction

The number of moles of Cr deposited by passing 1,5 F electricity in following reaction Cr+3e–– ›cr is

Answers

The number of moles of Cr deposited by 1.5 F of electricity is 0.5 moles

What is electrolysis?

The term electrolysis has to do with thee deposition of a solid when a direct current is passed through its solution.

Given the reaction;  Cr3+(aq)  + 3e ––›Cr(s)

If 3F of electricity is required to deposit  1 mole of Cr

1.5F of electricity is required to deposit  1.5F * 1 mole/3F

= 0.5 moles

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How dose earths solid inner core affect seismic waves

Answers

Answer:

When seismic waves from earthquakes ripple through its solid center, they hit a speed bump. The seismic vibrations should zip along about 30 percent faster than their actual speed, according to experiments and computer models re-creating the conditions inside the inner core.

Which of these is NOT true about electromagnets?






They are permanent.



Increasing the battery makes them stronger.



They need a battery or other source of current.



Increasing the number of coils makes them stronger.

Answers

Answer:

Permanent = false

Explanation:

All of the other choices are true

Can anyone please help me, the attachment is down below

Answers

Bubbling or fizzing is usually observed when a chemical reaction occurs and is denoted as option D.

What is a Chemical reaction?

This occurs when one or more reactant form a new substance which is referred to as the product.

The bubbling or fizzing depicts effervescence which signifies that a new gaseous product has been formed.

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Use the reaction and bond information to answer the question. H2 CO2 → CH2O2 Reactant bond energies: H–H is 432 kJ/mol, C=O is 799 kJ/mol Product bond energies: C–H is 413 kJ/mol, C=O is 745 kJ/mol, C–O is 358 kJ/mol, O–H is 467 kJ/mol How much energy must this system absorb before the reaction can begin?.

Answers

345678990098765435779999999999999999995699999

Calculate the solubility of Ca(OH)2 in a 0.469M CaCl2 solution at 31°C, given that the Ksp of Ca(OH)2 is 4.96 x 10-6 at that temperature. Give your answer in milliMolar units 2.927 mM 1.626 mM 2.764 mM 1.382 mM 1.463 mM 3.252 mM​

Answers

The solubility of Ca(OH)2 in a 0.469M CaCl2 solution at 31°C, at given Ksp of Ca(OH)2 is determined as 1.626 mM.

Dissociation reaction of Ca(OH)2

The dissociation reaction of Ca(OH)2 is given as follows;

Ca(OH)₂  ⇄ Ca²⁺  + 2OH⁻¹

                     x           2x

Concentration of Ca²⁺ = 0.469 M

Ksp = [x][2x]²

ksp = (0.469)(2x²)

ksp = 4(0.469)x²

ksp = 1.876x²

4.96 x 10⁻⁶ = 1.876x²

x² = (4.96 x 10⁻⁶)/(1.876)

x² = 2.643 x 10⁻⁶

x = √(2.643 x 10⁻⁶)

x = 1.626 x 10⁻³ M

x = 1.626 mM

Thus, the solubility of Ca(OH)2 in a 0.469M CaCl2 solution at 31°C, at given Ksp of Ca(OH)2 is determined as 1.626 mM.

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What volume of 12M HCI is needed to prepare 250
of 0.20M HCI?

Answers

Answer: 4.2

Explanation:

[tex]M_{A}V_{A}=M_{B}V_{B}\\(12)V_{A}=(250)(0.20)\\V_{A}=\frac{(250)(0.20)}{12}=\boxed{4.2}[/tex]

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