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Mole Concept and Avogadro's Number

100mL of a ga...

Question

100mL of a gaseous hydrocarbon on complete combustion gave 300mL of $C O_{2}$ (g). The number of atoms of carbon per molecule of the hydrocarbon would be?

A

1

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B

2

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C

3

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D

4

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Solution

The correct option is C 3
$C_{x} H_{y} + (x + \frac{y}{4}) O_{2} ⟶ x C O_{2} + \frac{y}{2} H_{2} O$

Volume ratio $= 1 : 3 =$ mole ratio.

$∵$ Mole rattio $= 1 : x ⟹ x = 3$

$∴$ No. of carbon atoms per molecule $= 3$ .

Hence the correct option is C.

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