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20. if average molecular weight of air is 29, then assuming N2 and O2 gases are there which option are correct regarding composition of air : 1] 75% by mass ofN2 2] 75% by moles of N2 3] 72.41% by mass of N2

Answer» 20. if average molecular weight of air is 29, then assuming N2 and O2 gases are there which option are correct regarding composition of air : 1] 75% by mass ofN2 2] 75% by moles of N2 3] 72.41% by mass of N2


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