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Q.

0.1 mole of Hydrocarbon on complete combustion produced 17.6 gms of ${C O}_{2}$ . How many Carbon atoms are present in each molecule of the hydrocarbon?

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answer is 4.

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Detailed Solution

Given, weight of $C O_{2} = 17.6$ gms.

$C_{x} H_{y} + (x + \frac{y}{2}) O_{2} ⟶ x {C O}_{2} + \frac{y}{2} H_{2} O$

Molar mass of ${C O}_{2} = 44 g$

Mole of ${C O}_{2} = \frac{17.6}{44} = 0.4$

Therefore, number of carbon atom is 4.

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