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 - Sri Chaitanya Infinity Learn Best Online Courses for NCERT Solutions, CBSE, ICSE, JEE, NEET, Olympiad and Class 6 to 12

A
only (i) is correct
B
only (ii) is correct
C
both (ii) and (iii) are correct
D
both (i) and (ii) are correct

Solution:

Let total mass be

$\begin{array}{l} M_{Avg} = \frac{Total mass}{Total moles} \\ 29 = \frac{100}{\frac{x}{23} + \frac{(100 - x)}{32}} \Rightarrow x = 72 .41 % \end{array}$

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

Solution:

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