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A gas mixture consisting of 3.2 g of methane and 2.8 g dinitrogen was prepared at...

A gas mixture consisting of 3.2 g of methane and 2.8 g dinitrogen was prepared at standard conditions. Percentage composition of this gas mixture was:

A. 53.3 wt.% CH4 and 46.7 wt.% N2
B. 60 vol.% CH4 and 40 vol.% N2
C. 60 mol.% CH4 and 40 mol.% N2
D. 66.7% of CH4 molecules and 33.3% of N2 molecules
E. A and D are correct

^answer is E but not sure how to find the percent composition of molecules.

Thanks

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