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ICSE Class 10 Chemistry 2016 Paper

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Question : 62 of 85
Marks: +1, -0
A gaseous hydrocarbon contains 82.76%82.76\% of carbon. Given that its vapour density is 29 , find its molecular formula. [C=12,H=1][\mathrm{C}=12, \mathrm{H}=1]
Solution:  
Volume of molecule
 =  No. of molecules NA× Molar Volume \, = \, \frac{ \text{ No. of molecules } }{ N_A } \times \text{ Molar Volume }
 = 12×10246×1023×22.4\, = \, \frac{12 \times 10^{24}}{6 \times 10^{23} \times 22.4}
 = 2×10×22.4\, = \, 2 \times 10 \times 22.4
 = 448 litres. \, = \, 448 \text{ litres. }
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