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Urea (NH2CONH2) is the end product in protein metabolism in animals. The decomposition of urea in 0.1 M HCl occurs according to the reaction

NH2CONH2(aq) + H+(aq) + 2 H2O(l) 2 NH4+(aq) + HCO3-(aq)

The reaction is first order in urea and first order overall. When [NH2CONH2] = 0.200 M, the rate at 61.05 °C is 8.56 × 10-5 M/s. (a) What is the rate constant, k? (b) What is the concentration of urea in this solution after 4.00 × 103 s if the starting concentration is 0.500 M? (c) What is the halflife for this reaction at 61.05 °C?

b) The integrated rate law for the first order reaction

can be used for calculation of the amount of substrate remained after any time period.

In this case,

c) The half-life for the first order reaction is

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Jarrod Robel
Jarrod RobelLv2
20 May 2020

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