the answer is M= 80.1 g/mol
but I want to understand how to do it.
PV = nRT
where P= pressure, V =volume, n=number of molecules, R =constant, T=temperature
P= 685*133.322= 91324.2 kg·m/(s^2)
so, n=PV/(RT)= (91324.2*0.000875)/(8.314472*308)= 0.0312
so molar mass= 2.5/0.0312= 80.1g/mol
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