NCERT Class XI Chemistry Equilibrium Solutions

Question : 9

Total: 73

Nitric oxide reacts with Br2 and gives nitrosyl bromide as reaction given below :
2NO(g)+Br2(g) ⇌ 2NOBr(g)
When 0.087 mol of NO and 0.0437 mol of Br2 are mixed in a closed container at constant temperature, 0.0518 mol of NOBr is obtained at equilibrium. Calculate equilibrium amount of NO and Br2.

Solution:

2NO(g)+Br2(g) ⇌ 2NOBr(g)

Initial‌moles	0.087	0.0437	0
Moles‌at‌eqm.	(0.087−2x)	(0.0437−x)	2x

But 2x = 0.0518 ∴ x = 0.0259
(nNO)eq = 0.087 – 0.0518 = 0.0352 mol
(nBr2)eq = 0.0437 – 0.0259 = 0.0178 mol

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