Nitric oxide reacts with {Br}₂ and gives ...

NCERT Class XI Chemistry Equilibrium Solutions

Question : 9 of 73

Marks: +1, -0

Nitric oxide reacts with

\mathrm{Br}_2

and gives nitrosyl bromide as reaction given below :

2\mathrm{NO}_{(g)} + \mathrm{Br}_{2(g)}

⇌

2\mathrm{NOBr}_{(g)}

When 0.087 mol of NO and 0.0437 mol of

\mathrm{Br}_2

are mixed in a closed container at constant temperature, 0.0518 mol of NOBr is obtained at equilibrium. Calculate equilibrium amount of NO and

\mathrm{Br}_2

Solution:

2\mathrm{NO}_{(g)} + \mathrm{Br}_{2(g)}

⇌

2\mathrm{NOBr}_{(g)}

\begin{array}{c|c|c|c} \text{Initial moles} & 0.087 & 0.0437 & 0 \\ \text{Moles at eqm.} & (0.087-2x) & (0.0437-x) & 2x \end{array}

But 2x = 0.0518 ∴ x = 0.0259

(n_{\mathrm{NO}})_{\mathrm{eq}}

= 0.087 – 0.0518 = 0.0352 mol

(n_{\mathrm{Br}_2})_{\mathrm{eq}}

= 0.0437 – 0.0259 = 0.0178 mol

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