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Q.

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%
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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