The density of a test gas is to be determined experimentally at 302.7 K using an apparatus constructed of a 4.100 L glass bulb volume that is attached to a vacuum pump. The mass of the evacuated bulb is 21.347 g. After it is filled with the test gas to a pressure of 0.0250 atm, the mass increases to 21.557 g. Assume the gas behaves ideally.
How many moles of gas are in the bulb? What is the apparent molar mass of the gas?