A reaction in which A, B, and C react to form products is first order in A, seco
ID: 1084052 • Letter: A
Question
A reaction in which A, B, and C react to form products is first order in A, second order in B, and zero order in C.
Write a rate law for the reaction.
What is the overall order of the reaction?
By what factor does the reaction rate change if [A] is doubled (and the other reactant concentrations are held constant)?
By what factor does the reaction rate change if [B] is doubled (and the other reactant concentrations are held constant)?
By what factor does the reaction rate change if [C] is doubled (and the other reactant concentrations are held constant)?
By what factor does the reaction rate change if the concentrations of all three reactants are doubled?
Explanation / Answer
1)
rate law = k [A][B]2
2)
overall order = 1 + 2 + 0 = 3
overall order of reaction = 3
3)
a)
rate = k [A][B]^2
if [A] is double = 2A
rate = k [2A][B]^2
= 2 k [A][B]^2
rate change by a factor = 2
b)
rate = k [A][B]^2
= k [A][2B]^2
rate = 4 k [A][B]^2
rate change by a factor = 4
c)
no change in reaction rate.
d)
rate = k [2A][2B]^2
= 8 k[A][B]^2
rate change by a factor = 8
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