The decomposition of NH3 on platinum surface is zero order reaction. If k = 2.5 × 10-4 mol L-1s-1 the rate of production of H2 is

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CUET Chemistry 10th Aug 2022 Official Paper
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  1. 2.5 × 10-4 mol L-1s-1
  2. 7.5 × 10-4 mol L-1s-1
  3. 5.0 × 10-4 mol L-1s-1
  4. 10.0 × 10-4 mol L-1s-1

Answer (Detailed Solution Below)

Option 2 : 7.5 × 10-4 mol L-1s-1
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\(2 \mathrm{NH}_3 \stackrel{\mathrm{Pt}}{\longrightarrow} \mathrm{N}_2+3 \mathrm{H}_2\)

As reaction is zero order

Rate = k[NH3]0

Rate = k

Rate = \(\frac{-1}{2} \frac{\Delta\left[\mathrm{NH}_3\right]}{\Delta \mathrm{t}}=\frac{1}{3} \frac{\Delta\left[\mathrm{H}_2\right]}{\Delta \mathrm{t}}=\mathrm{k}\)

\(\frac{\Delta H}{\Delta t}=3 k\)

= 3 × 2.5 × 10–4

= 7.5 × 10–4 mol L–1 s–1

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