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Question

Ammonia and oxygen reacts at higher temperatures as
4NH3(g)+5O2(g)4NO(g)+6H2O(g)
In an experiment, the concentration of NO increases by 2.16×102 mol litre1 in 3 seconds.

Which of the following is correct?

A
Rate of the reaction is 7.2×103 molL1s1
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B
Rate of disappearance of ammonia is 7.2×103 molL1s1
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C
Rate of formation of water is 4.32×102 molL1s1
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D
Rate of disappearance of oxygen is 3.6×102 molL1s1
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Solution

The correct option is B Rate of disappearance of ammonia is 7.2×103 molL1s1

The rate expression can be written as,
14Δ[NH3]Δt=15Δ[O2]Δt=14Δ[NO]Δt=16Δ[H2O]Δt
rreaction=14d[NO]dt=2.16×1024×3=1.8×103molL1s1
Rate of disappearance of ammonia is = rreaction×4=7.2×103 molL1s1
Rate of formation of water is = rreaction×6=1.08×102 molL1s1
Rate of disappearance of oxygen is = rreaction×5=9.0×103 molL1s1

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