Explanation Assume oxygen and helium as an ideal gas and volume and temperature are constant for both of them. So, ideal gas law is used to calculate the number of moles in helium gas. Write the expression for number of moles. n ( moles ) = mass molecular mass (I) Here, n is the number of moles. Write the expression for ideal gas law. P V = n R T Here, P is the pressure, V is volume, R is gas constant and T is temperature. Write the expression for absolute pressure. P abs = P atm + P (II) Here, P abs is the absolute pressure, P atm is the atmospheric pressure and P is the gauge pressure. As volume and temperature are constant for both of them so the ratio of P n also remain constant. P 1 n 1 = P 2 n 2 Here, P 1 is the absolute pressure of oxygen, P 2 is the absolute pressure of helium, n 1 is the number of moles in oxygen and n 2 is the number of moles of helium. Rearrange above equation for n 2 . n 2 = P 2 P 1 n 1 (III) Rearrange Equation (I) for mass. mass = n ( molecular mass ) (IV) Conclusion: Substitute 30

Physics for Scientists and Engineers with Modern Physics

4th Edition

ISBN: 9780131495081

Author: Douglas C. Giancoli

Publisher: Addison-Wesley

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First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of en…

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Chapter 17, Problem 40P

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The mass of the helium gas produced.

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Chapter 17, Problem 39P

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Physics for Scientists and Engineers with Modern Physics

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The mass of the helium gas produced.

Solution Summary: The author explains how the ideal gas law is used to calculate the number of moles in helium gas.

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