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(c) Urea (NH2CONH2), which is the end product in protein metabolism in animals, undergoes decomposition in 0.1 M HCl according to the reaction: NH2CONH2 (aq) + H+ (aq) + 2H2O (l) → 2NH4+ (aq) + HCO3- (aq). The reaction is first order in urea and first order overall. When [NH2CONH2] = 0.200 M, the rate at 61 °C is 8.56 x 10^-5 M s^-1. (i) What is the value of the rate constant? (ii) What is the concentration of urea in this solution after 1 hour if the starting concentration is 0.500 M? (iii) How long does it take for the initial concentration of urea to decrease to half its value at 61 °C? (iv) What is the proportion of starting material that remains after three (3) half-lives?

          (c) Urea (NH2CONH2), which is the end product in protein metabolism in animals, undergoes decomposition in 0.1 M HCl according to the reaction: NH2CONH2 (aq) + H+ (aq) + 2H2O (l) → 2NH4+ (aq) + HCO3- (aq).
The reaction is first order in urea and first order overall. When [NH2CONH2] = 0.200 M, the rate at 61 °C is 8.56 x 10^-5 M s^-1.
(i) What is the value of the rate constant?
(ii) What is the concentration of urea in this solution after 1 hour if the starting concentration is 0.500 M?
(iii) How long does it take for the initial concentration of urea to decrease to half its value at 61 °C?
(iv) What is the proportion of starting material that remains after three (3) half-lives?

Added by Antonia N.

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