Chemical BondingHard
Question
The rate expression for the reaction:
NH4CNO ⇋ NH2CONH2 can be derived from he mechanism:
i. NH4CNO
NH2NCO (Fast)
ii. NH4NCO
NH3 + HNCO (Fast)
iii. NH3 + HNCO
NH2CONH2 (Slow)
Which of the following statement(s) is/are correct about the rate expression ?
NH4CNO ⇋ NH2CONH2 can be derived from he mechanism:
i. NH4CNO
NH2NCO (Fast)ii. NH4NCO
NH3 + HNCO (Fast)iii. NH3 + HNCO
NH2CONH2 (Slow)Which of the following statement(s) is/are correct about the rate expression ?
Options
A.
[NH4NCO]
[NH4NCO]B.
[NH4NCO]
[NH4NCO]C.
= k[NH4NCO]
= k[NH4NCO]D.
[NH4NCO]
[NH4NCO]Solution
[NH2CONH2] = k4[NH3][HNCO] from (iii)Applying steady state approximation to HNCO or NH3
= O = k3 [NH4NCO] - k4[NH3][HNCO]∴
= k4 × [NH3][HNCO] = k4 × 
[NH4NCO]Also, [NH4NCO] =
× [NH4CNO]∴
= k3 × 
× [NH4CNO]= k[NH4CNO]
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