Chemistry

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HELP! we just started kinetics and i have no clue how to solve this problem.

For the reaction between reactants A and B below, if 4.925 moles of A is placed into a flask with excess B it is found that the amount of A remaining after 6.85 seconds is 2.737 moles.

2A (g) + B (g)-----> 3 C (g)

a. find the rate of reaction with respect to A (in Ms^-1)
b. find the rate of the reaction with respect to B
c. find the reate of the reaction with respect to C

i'm really struggling with learning kinetics. :[

thank you.

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