A volume of 1 ml of a gaseous aliphatic compound CnH3nOm is completely burnt in an excess of oxygen.

Question

A volume of 1 ml of a gaseous aliphatic compound CnH3nOm is completely burnt in an excess of oxygen. The contraction in volume (in ml) is

Accepted Answer

$C_{n}H_{3n}O_{m} + \left( \frac{7n}{4} - \frac{m}{2} \right)O_{2} \rightarrow nCO_{2} + \frac{3n}{2}H_{2}O(l)$

$1\text{ mL} \left( \frac{7n}{4} - \frac{m}{2} \right)\text{ mL} n\text{ mL} 0$

Hence, contraction in volume $= \left( 1 + \frac{7n}{4} - \frac{m}{2} \right) - n = \left( 1 + \frac{3n}{4} - \frac{m}{2} \right)\text{ mL}$

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