Answer: Calculating the Molar Mass of a GasA large
Chapter , Problem 2PE(choose chapter or problem)
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.
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