You may or may not be right. How did you get your answer? That is the important part.
i found the gram formula mass for each gas and took it away from the gram given in the example
Close but no cigar.
You find the gram formula mass, which is
16 for CH4
17 for NH3
44 for CO2
64 for SO2.
So you have 1 mole CH4
2 moles NH3
1 mole CO2
1 mole for SO2.
Now which will occupy the most volume at the same P and T.
You may want to use
PV = nRT
You know P is the same, R is the same, T is the same. So the highest V is for the xxxxx n.
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