If average molecular wt. of air is 29, then assuming N2 and O2 gases are there which options are correct regarding composition of air:(i) 75% by mass of N2 (ii) 75% by moles N2 (iii) 72.47% by mass of N2
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a
only (i) is correct
b
only (ii) is correct
c
both (ii) and (iii) are correct
d
both (i) and (ii) are correct
answer is C.
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Detailed Solution
Let total mass be MAvg=Total massTotal moles29=100x23+(100−x)32⇒x=72.41%