Problem: Avogadros hypothesis. At the same volume, pressure, and temperature, samples of different gases have the same number of molecules but different masses.How many moles of gas are in each vessel?

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Recall that the molar volume of a gas at STP (273.15 K and 1 atm) is 22.4 L

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At the same volume, pressure, and temperature, samples of different gases have the same number of molecules but different masses.  At a volume of 22.4 liters, with a pressure of 1 atmosphere and a temperature of 0 degrees celsius, helium will have a mass of 4.00 grams, diatomic nitrogen will have a mass of 28.0 grams, and methane will have a mass of 16.0 grams.  All three will have a quantity of gas molecules equal to 6.02 times 20^23.

Avogadros hypothesis. At the same volume, pressure, and temperature, samples of different gases have the same number of molecules but different masses.

How many moles of gas are in each vessel?

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