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# Answer: Calculating the Molar Mass of a GasA large

ISBN: 9780321910417 77

## Solution for problem 2PE Chapter 10.8SE

Chemistry: The Central Science | 13th Edition

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Problem 2PE

Calculating the Molar Mass of a Gas

A large evacuated flask initially has a mass of 134.567 g. When the flask is filled with a gas of unknown molar mass to a pressure of 735 torr at 31 °C. its mass is 137.456 g. When the flask is evacuated again and then filled with water at 31 °C. its mass is 1067.9 g. (The density of water at this temperature is 0.997 g/mL.) Assuming the ideal-gas equation applies, calculate the molar mass of the gas.

Calculate the average molar mass of dry air if it has a density of 1.17 g/L at 21 °C and 740.0

torr.

Step-by-Step Solution:
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12.1 The Condensed Phases  At a given temperature, the magnitude of intermolecular forces determines whether a substance is a solid, a liquid, or a gas. 12.2 Properties of Liquids  Several of the physical properties of a liquid depend on the magnitude of its intermolecular forces. 1 Surface Tension o A molecule within a liquid is pulled in all directions...

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Answer: Calculating the Molar Mass of a GasA large

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