If a reaction is first-order with respect to a particular reactant, when the con

Question

If a reaction is first-order with respect to a particular reactant, when the concentration of that reactant is increased by a factor of 2, the reaction rate will _____.
A)   increase by a factor of 2.
B)   remain constant.
C)   decrease by a factor of .
D)   decrease by a factor of .
E)   increase by a factor of 4.

At a given temperature, a first-order reaction has a rate constant of 3.5 X 10–3 s–1. How long will it take for the reaction to be 24% complete?
A)   410 s
B)   1200 s
C)   910 s
D)   34 s
E)   78 s

Explanation / Answer

1.If a reaction is first-order with respect to a particular reactant, when the concentration of that reactant is increased by a factor of 2, the reaction rate will increase by a factor of 2.

2. K = 2.303/t*log(a/a-x) [ a= 100, (a-x) = 74]

3.5*10^-3 = 2.303/t*log(100/76)

t = 78 s

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