Q24 / 90 · JEE Main 2023 (10 Apr Shift 2) · Chemistry

A(g)⇌2 B( g)+C(g)

For the given reaction, if the initial pressure is 450 mmHg and the pressure at time t is720 mmHg at a constant temperatureT and constant volume V. The fraction of A(g) decomposed under these conditions is x×10-1. The value of x is (nearest integer)

Correct answer: 3

Solution

                   Ag⇌2Bg+Cg  intial            450             0         0at time=t    450-p       2p         p

(450 – p) + (2p) + (p) = 720

450 + 2p = 720

2p= 270 

p= 135

Fraction of A(g) decomposed=Amount of A decomposedInitial amount  =135450=0.3

The fraction Ag decomposed = 3×10-1

⇒x=3

Hence, the correct answer is 3.

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