Chemistry Practice Problems Rate Law Practice Problems Solution: The reaction A + B yields C + D rate = k[A][B] 2 h...

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Solution: The reaction A + B yields C + D rate = k[A][B] 2 has an intial rate of 0.0220 M/s.a) What will the initial rate be if [A] is halved and [B] is tripled? Answer must be in M/s.b) What will the intial rate be if [A] is tripled and [B] is halved? Answer must be in M/s.

Problem

The reaction A + B yields C + D rate = k[A][B] has an intial rate of 0.0220 M/s.

a) What will the initial rate be if [A] is halved and [B] is tripled? Answer must be in M/s.

b) What will the intial rate be if [A] is tripled and [B] is halved? Answer must be in M/s.

Solution

a) $Rate = k[A][B]^2$

Original initial rate: $0.0220 \ M/s = k[1][1]^2$

New initial rate: $Rate = [½] [3]^3 = 9/2$ times the original

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