February 10, 2016

Homework Help: chemistry class

Posted by tere on Sunday, October 24, 2010 at 3:15pm.

A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g) → B(g). The following data are
obtained for (A) as the reaction proceeds:

Time (s) 1 10 20 30 40
Moles of A 0.124 0.110 0.088 0.073 0.054

1) The average rate of disappearance of A between 10 s and 20 s is __________ mol/s.
answer: 2.2 10-3

2) If the rate law for the reaction
2A + 3B → products
is second order in A and first order in B, then the rate law is rate = __________.
answer: k(A)2(B)

i know the answers but how do i figure problems like the above? i have a bunch of similar problems to figure out.

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