10 ml of nitrogen hydride were enclosed in an eudiometer and subjected to electric sparks. The sparks were continued till there was no further increase in volume. The volume after sparking measured 20

Question

10 ml of nitrogen hydride were enclosed in an eudiometer and subjected to electric sparks. The sparks were continued till there was no further increase in volume. The volume after sparking measured 20 ml. Now 30 ml of O 2 ​ were added and sparking was continued again. The new volume then measured 27.5 ml . All volumes were measured under identical conditions of temperature and pressure. Nitrogen and Hydrogen are diatomic. Calculate the volume (in ml) of N 2 ​ gas in final gas mixture.

TestHub · Accepted Answer

Let nitrogen hydride be NₓHᵧ. On sparking,

$N_{x} H_{y} \to \frac{x}{2} N_{2} + \frac{y}{2} H_{2}$

Volume increases from 10 mL to 20 mL, so gases formed are 5 mL N₂ and 15 mL H₂.

Hydrogen reacts with oxygen:

$2 H_{2} + O_{2} \to 2 H_{2} O$

15 mL H₂ consumes 7.5 mL O₂, leaving $30 - 7.5 = 22.5$ mL O₂. Thus, final gases = 5 mL N₂ + 22.5 mL O₂ = 27.5 mL (matches given).

$V o l u m eo f N_{2} = 5 m L$

Chemistry - Mole Concept Question with Solution | TestHub

Doubts & Discussion