Solved: Calculating the Molar Mass of a GasA large
Chapter , Problem 1PE(choose chapter or problem)
Problem 1PE
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.
What is the molar mass of an unknown hydrocarbon whose density is measured to be 1.97 g/L at STP? (a) 4.04 g/mol. (b) 30.7 g/mol. (c) 44.1 g/mol. (d) 48.2 g/mol.
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