Given the data below from a study on how the rate of a reaction was affected by

Question

Given the data below from a study on how the rate of a reaction was affected by the concentration of the reactants,

run 1: [A] = 0.200 M, [B] = 0.100 M, [C] = 0.600 M, rate = 5.0 mol L-1 hr-1

run 2: [A] = 0.200 M, [B] = 0.400 M, [C] = 0.400 M, rate = 80 mol L-1 hr-1 r

un 3: [A] = 0.600 M, [B] = 0.100 M, [C] = 0.200 M, rate = 15 mol L-1 hr-1 run

4: [A] = 0.200 M, [B] = 0.100 M, [C] = 0.200 M, rate = 5.0 mol L-1 hr-1

run 5: [A] = 0.200 M, [B] = 0.200 M, [C] = 0.400 M, rate = 20.0 mol L-1 hr-1

which of the statements below is true?

Select one: a. the reaction is first order with respect to A b. the reaction is second order with respect to A c. the reaction is zero order with respect to A d. the reaction order for A is minus one (Rate proportional to 1/[A]) e. the reaction order for A cannot be determined from just this data alone

Explanation / Answer

1) run 3: [A] = 0.600 M, [B] = 0.100 M, [C] = 0.200 M, rate = 15 mol L-1 hr-1 run

run 4: [A] = 0.200 M, [B] = 0.100 M, [C] = 0.200 M, rate = 5.0 mol L-1 hr-1

order with respect to [A] = 1

2) run 2: [A] = 0.200 M, [B] = 0.400 M, [C] = 0.400 M, rate = 80 mol L-1 hr-1 r

run 5: [A] = 0.200 M, [B] = 0.200 M, [C] = 0.400 M, rate = 20.0 mol L-1 hr-1

order with respect to [B] = 2

2) run 1: [A] = 0.200 M, [B] = 0.100 M, [C] = 0.600 M, rate = 5.0 mol L-1 hr-1

run 4: [A] = 0.200 M, [B] = 0.100 M, [C] = 0.200 M, rate = 5.0 mol L-1 hr-1

order with respect to [C] = zero

Answer = a. the reaction is first order with respect to A

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