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 2.16×10–2mollitre–1 in 3 seconds.
Which of the following is correct?
A
Rate of the reaction is 7.2×10−3molL−1s−1
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B
Rate of disappearance of ammonia is 7.2×10−3molL−1s−1
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C
Rate of formation of water is 4.32×10−2molL−1s−1
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D
Rate of disappearance of oxygen is 3.6×10−2molL−1s−1
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Solution
The correct option is B Rate of disappearance of ammonia is 7.2×10−3molL−1s−1
The rate expression can be written as, −14Δ[NH3]Δt=−15Δ[O2]Δt=14Δ[NO]Δt=16Δ[H2O]Δt rreaction=14d[NO]dt=2.16×10−24×3=1.8×10−3molL−1s−1 Rate of disappearance of ammonia is = rreaction×4=7.2×10−3molL−1s−1 Rate of formation of water is = rreaction×6=1.08×10−2molL−1s−1 Rate of disappearance of oxygen is = rreaction×5=9.0×10−3molL−1s−1