J.R. S. answered 01/22/18
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The volume of the gas will depend on the temperature and the pressure. If the methane gas is at STP, then 1 mole = 22.4 liters. Thus, at STP 3.62 moles of gas = 3.62 mol x 22.4 liters/mole = 81.1liters.

J.R. S.
tutor
@Will S. The moles is given in the question. It is 3.62 moles. The mass would not change with pressure and temperature. It would be 3.62 moles x 16 g/mol = 57.9 g. If you are asking what the volume would be, then it would be calculated from V = nRT/P where n = 3.62 mol; R = 0.0821 Latm/Kmol; T = 331K; and P = 460/760 = 0.605 atm; The volume would be 163 L (not 19 L). So, in summary, I'm not really sure what you are asking.
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05/29/20
Will S.
What if the methane gas was not specified to be at STP, my question is how many moles, and what would the mass be if the pressure was 460mmHg, had a temperature of 58 C, and a volume of 19L05/29/20