A study of the conversion of ammonium cyanate to urea in solution, NH4CNO → CO(NH2)2 gave the following results: Initial concentration (moles/litre) 0.05, 0.10, 0.20; Time for half conversion (h) 37.8

Question

A study of the conversion of ammonium cyanate to urea in solution, NH4CNO → CO(NH2)2 gave the following results: Initial concentration (moles/litre) 0.05, 0.10, 0.20; Time for half conversion (h) 37.82, 18.95, 9.45. t_1/2 of reaction for an initial concentration of 0.15 M, is

Prashant Kotian · Accepted Answer

Correct answer: B. The product of initial concentration and half-life is constant (0.05 × 37.82 ≈ 1.89), meaning the reaction is second order. At 0.15 M, t_1/2 = 1.89 / 0.15 = 12.6 h. Therefore, correct answer is B.

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