question 20 only. C. D. E, R. 19. Sucrose, C12H22011, reacts slowly with water i

Question

question 20 only.

C. D. E, R. 19. Sucrose, C12H22011, reacts slowly with water in the presence of an acid to form two ot sugars, glucose and fructose, both of which have the same molecular formulas, but different structures. C12H2011+ HO (CH12O% (glucose)+ CH 20s (fructose The reaction is first order and has a rate constant of 6.2 (10/s at 35(C when the H' concentratio is 0.10 M. Suppose that the initial concentration of sucrose in the solution is 0.40 M. How many minutes will it take for the sucrose concentration to drop to 0.30 M? 20. Nitrogen pentoxide decomposes by a first-order process yielding N,O, and oxygen. At a given temperature, the half-lite of N,O, Is 0.90 hr. What is the first-order rate constant for N,0s decomposition?

Explanation / Answer

20)
Given:
Half life = 0.90 hr
use relation between rate constant and half life of 1st order reaction

k = (ln 2) / k
= 0.693/(half life)
= 0.693/(0.90)
= 0.77 hr-1
Answer: 0.77 hr-1

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