Chemistry College

Element A has two isotopes. The first isotope is present 18.18% of the time and has a mass of
147.99. The second isotope has a mass of 127.76. Calculate the atomic mass of element A. (To two
decimals places)

Answers

Answer 1

The atomic mass of element A, given that the first isotope has abundance of 18.18% and a mass of 147.99, is 131.43 amu

How do i determine the atomic mass of element A?

From the question given above, the following data were obtained:

Abundance of 1st isotope (1st%) = 18.18%Mass of 1st isotope = 147.99Mass of 2nd isotope = 127.76 Abundance of 2nd isotope (2nd%) = 100 - 18.18 = 81.82%Atomic mass of element A=?

The atomic mass of the element A can be obtain as illustrated below:

Atomic mass = [(Mass of 1st × 1st%) / 100] + [(Mass of 2nd × 2nd%) / 100]

Inputting the given parameters, we have:

Atomic mass = [(147.99 × 18.18) / 100] + [(127.76 × 81.82) / 100]

Atomic mass = 26.90 + 104.53

Atomic mass = 131.43 amu

Thus, the atomic mass of element A obtained from the above calaculation is 131.43 amu

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Related Questions

help please! predict whether each substance will dissolve in water.

Answers

The compound n - hexane as shown does not dissolve in water.

Why does n - hexane not dissolve in water?

Due to a large difference in polarity between the two compounds, n-Hexane does not dissolve in water.

Water is a polar molecule, which means that one end of it (the hydrogen side) has a slight positive charge and the other end (the oxygen side) has a slight negative charge. The unequal distribution of electrons within the water molecule, which produces a dipole moment, is the cause of this polarity.

N-Hexane, on the other hand, is a nonpolar molecule. The electrons are uniformly distributed throughout the molecule, which is made up of carbon and hydrogen atoms bound together in a straight chain. N-Hexane lacks a substantial dipole moment as a result.

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Offer two reasons why carbon dioxide does not dissolve well in soda once the bottle has been opened (Someone pls answer )

Answers

The escape of the carbon dioxide molecules from the surface. Option 4.

What are the reasons?

The area where the soda and surrounding air come into contact when the soda bottle is opened rises. The exchange of gases between the soda and the atmosphere is facilitated by the increased surface area.

The molecules of carbon dioxide have a tendency to leave the liquid phase and transition into the gas phase as they come into contact with the air. The action in question is called degassing. The soda's concentration of dissolved carbon dioxide is decreased and its capacity to dissolve further due to the ongoing emission of carbon dioxide.

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If you have 2.60 X 1023 molecules of (NH4)3PO4, how many grams do you have?

Answers

If you have 2.60 x 10²³ molecules of (NH₄)₃PO₄, you have 64.7 grams of it.

The number of particles contained in a sample is measured in terms of the mole. One mole of a compound is the quantity of that substance that has a mass in grams equal to its relative atomic or molecular mass (atomic weight).To find the number of moles of (NH₄)₃PO₄, we'll need to use the Avogadro constant, which is 6.02 x 10²³. We can use the formula:moles = particles ÷ Avogadro constantThe number of particles is given as 2.60 x 10²³. Substituting the values:moles = 2.60 x 10²³ ÷ 6.02 x 10²³moles = 0.432Molar massNow that we have the number of moles of (NH₄)₃PO₄, we can compute its mass. The molecular mass of (NH₄)₃PO₄ is 149.0 g/mol. We can use the formula:mass = moles x molecular mass Substituting the values:mass = 0.432 x 149.0mass = 64.7 grams

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Part A
A solution of cough syrup contains 5.00% active ingredient by volume. If the total volume of the bottle is 68.0 mL, how many milliliters of ac
ingredient are in the bottle?
Express your answer with the appropriate units.

Answers

There are 3.4 milliliters of the active ingredient in the cough syrup bottle.

To calculate the volume of the active ingredient in the cough syrup bottle, we need to multiply the total volume of the bottle by the percentage of the active ingredient.

Given:

Total volume of the bottle = 68.0 mL

Percentage of active ingredient = 5.00%

First, we convert the percentage to a decimal by dividing it by 100:

Percentage of active ingredient = 5.00% = 5.00/100 = 0.05

Next, we calculate the volume of the active ingredient:Volume of active ingredient = Total volume of the bottle × Percentage of active ingredient

Volume of active ingredient = 68.0 mL × 0.05

Volume of active ingredient = 3.4 mL

Therefore, there are 3.4 milliliters of the active ingredient in the cough syrup bottle.

It's important to note that the calculation assumes a homogeneous distribution of the active ingredient throughout the solution.

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What are two types of fibres obtained from the fleece of a sheep? Which one is used to make wool?​

Answers

Answer: The two types of fibres obtained from the fleece of a sheep are beard hair, which are coarse and fine, and soft under hair, which grow near the skin. The under hair are used to make wool

Answer:

Answer: The two types of fibres obtained from the fleece of a sheep are beard hair, which are coarse and fine, and soft under hair, which grow near the skin. The under hair are used to make wool.

Explanation:

mark brainly please!

(I didn't copy the person above me! I just realized we had the same answer.)

7. A 795.0 mL volume of hydrogen gas is collected at 23 oC and 1055 torr. What volume will it occupy at STP?

Answers

The volume of hydrogen gas at STP is 670.7 mL.

The given information is,Volume of hydrogen gas = 795.0 mLTemperature (T) = 23 oCPressure (P) = 1055 torrWe are required to find the volume of hydrogen gas at STP.STP stands for Standard Temperature and Pressure. It is used as a standard for measurement of gas volume and pressure. The standard temperature is 0 oC or 273.15 K and the standard pressure is 1 atm or 760 mmHg or 101.325 kPa.1 atm = 760 mmHg = 101.325 kPaSTP Conditions:T = 273.15 KP = 1 atmFrom the ideal gas law, we havePV = nRTWhere, P is pressureV is volumeT is temperature n is the number of moles of gasR is the gas constantFor the comparison of volumes, we must have the same value of n and R on both sides of the equation.So, we can write the above equation asP₁V₁/T₁ = nR/P₂V₂/T₂Where,P₁, V₁ and T₁ are the initial valuesP₂, V₂ and T₂ are the final valuesFor the given data, we can write1055 torr x 795.0 mL / (273.15+23) K = nR/1 atm x V₂/273.15 KThe initial pressure and volume do not match the standard conditions. We have to convert the given pressure and volume to the standard conditions.Using the ideal gas law, we can writePV = nRTWe can rewrite this equation asP₁V₁/T₁ = P₂V₂/T₂Where,P₁, V₁ and T₁ are the initial valuesP₂, V₂ and T₂ are the final valuesFor the given data, we can write1055 torr x 795.0 mL / (273.15+23) K = P₂ x V₂ / (273.15 K)Rearranging this equation, we getP₂V₂ = 1 atm x 795.0 mL / (273.15 K) x 1055 torrP₂V₂ = 768.47 mLWe can now use the final pressure and volume to calculate the volume at STP.P₁V₁/T₁ = P₂V₂/T₂V₂ = P₁V₁T₂ / T₁P₁ = 1 atmV₁ = 768.47 mLT₁ = 23 oC + 273.15 = 296.15 KV₂ = 1 atm x 768.47 mL / 1055 torr x 296.15 K / 273.15 KV₂ = 670.7 mL

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Make the arbitrary assignment of the reduction of Zn2+(aq) to Zn(s) as you 0 V for your brief list.

Zn^2+(aq) +2e- → Zn(s) E = 0 V

Answers

The arbitrary assignment of the reduction of Zn2+(aq) to Zn(s) as E = 0 V serves as a reference point for determining the relative reduction potentials of other redox reactions. This assignment is based on the convention that the standard reduction potential

In the case of the Zn2+(aq) to Zn(s) reduction, the reaction involves the gain of two electrons by Zn2+ ions, leading to the formation of solid zinc metal. The assigned reduction potential of 0 V indicates that, under standard conditions (1 M concentration, 25°C, and 1 atm pressure), the Zn2+ ions have a tendency to accept electrons and be reduced to Zn metal.

Any reduction potential above 0 V suggests a greater tendency for reduction, while a negative reduction potential indicates a lower tendency for reduction compared to the Zn2+(aq) to Zn(s) reaction.

This reference potential allows us to compare the reactivity of other redox systems and predict the feasibility of different reactions. The more positive the reduction potential, the greater the tendency for reduction to occur. Therefore, if we encounter a reduction potential of +0.34 V for another reaction, we can infer that it is more likely to occur spontaneously compared to the Zn2+(aq) to Zn(s) reduction. Conversely, if we encounter a reduction potential of -0.50 V, we can conclude that the reverse reaction (oxidation) is more favorable than the reduction of Zn2+(aq) to Zn(s).

Overall, the assignment of E = 0 V for the reduction of Zn2+(aq) to Zn(s) provides a benchmark for understanding the electrochemical behavior of other redox reactions and allows us to make predictions based on the relative reduction potentials.

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The kinetic energy of a 23.2-g object moving at a speed of 98.7 m/s is ________ J. The kinetic energy of a 23.2-g object moving at a speed of 98.7 m/s is ________ J. 0.950 145 113 1450 113000

Answers

The kinetic energy of a 23.2-g object moving at a speed of 98.7 m/s is  113.30 J. Option D

The kinetic energy of an object can be calculated using the formula: KE = (1/2)mv^2, where KE is the kinetic energy, m is the mass of the object, and v is the velocity or speed of the object.

Given:

Mass (m) = 23.2 g = 0.0232 kg

Speed (v) = 98.7 m/s

Substituting these values into the formula, we can calculate the kinetic energy:

KE = (1/2)(0.0232 kg)(98.7 m/s)^2

KE = (1/2)(0.0232 kg)(9756.09 m^2/s^2)

KE ≈ 113.30 J

Therefore, the kinetic energy of a 23.2-g object moving at a speed of 98.7 m/s is approximately 113.30 J.

It's worth noting that the question is repeated twice, but the answer remains the same. The kinetic energy of the object is determined by its mass and speed, and both calculations yield the same result. Option D

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