Suppose you are given two flasks at the same temperature,
one of volume 2 L and the other of volume 3 L. The 2-L flask
contains 4.8 g of gas, and the gas pressure is x kPa. The 3-L
flask contains 0.36 g of gas, and the gas pressure is 0.1x. Do
the two gases have the same molar mass? If not, which contains
the gas of higher molar mass?
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Master The Ideal Gas Law: Molar Mass with a bite sized video explanation from Jules Bruno