A reaction in which A, B, andC react to form products is first order in A, secon
ID: 820475 • Letter: A
Question
A reaction in which A, B, andC react to form products is first order in A, second order in B and zero order in C . Rate k (A)(B)^2
1-what is the overall order of the reaction
2_
By what factor does the reaction rate change if A is doubled (and the order reactant concentrations) rate2/rate 1
3_by what factor does the reaction rate change if B is doubled and the other reactant concentration are held constant
By what factor does the reaction rate change C is doubled and the other reactant concentration are held constant
4_by what factor does the reaction rate change if the concentration of all three reactant are doubled
Explanation / Answer
(1) Rate = k[A][B]^2
Overall order = sum of individual orders
= 1 + 2 + 0 = 3
(2) If [A2] = 2 x [A1], [B2] = [B1], [C2] = [C1]
Rate2 = k[A2][B2]^2
= k x 2 x [A1] x [B1]^2
= 2 x k[A1][B1]^2
= 2 x Rate1
Factor = 2
(3) If [A2] = [A1], [B2] = 2 x [B1], [C2] = [C1]
Rate2 = k[A2][B2]^2
= k x [A1] x (2 x [B1])^2
= 4 x k[A1][B1]^2
= 4 x Rate1
Factor = 4
(4) If [A2] = [A1], [B2] = [B1], [C2] = 2 x [C1]
Rate2 = k[A2][B2]^2
= k x [A1] x [B1]^2
= 1 x k[A1][B1]^2
= 1 x Rate1
Factor = 1
(5) If [A2] = 2 x [A1], [B2] = 2 x [B1], [C2] = 2 x [C1]
Rate2 = k[A2][B2]^2
= k x 2 x [A1] x (2 x [B1])^2
= 8 x k[A1][B1]^2
= 8 x Rate1
Factor = 8
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