Mole ConceptMedium
Question
A volume of 10 ml hydrogen requires 25 ml air for complete combustion. The volume per cent of N2 in air is
Options
A.20%
B.80%
C.79%
D.5%
Solution
2H2 + O2 → 2H2O
10 mL 5 mL
Hence, N2 = 25 − 5 = 20 mL = $\frac{20}{25}$×100 = 80%
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