Problem- the gas phase reaction a b c has a reaction rate, Ask an Expert

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Problem- The gas phase reaction A + B ? C has a reaction rate which is experimentally observed to follow the relationship rate = k[A]2[B]. Which one of the following would affect the value of the specific rate constant, k?

(1) decreasing the temperature

(2) changing the concentration of A

(3) changing the concentration of B

(4) changing the concentration of C

(5) letting the reaction go on for a long time

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