Okay, this is a question in several parts that really stumps me:

Given the following reaction determine the rate of expression
(CH3)3CBr + OH -----> (CH3)3COH + r

[(CH3)3CBr] OH Initial reaction rate (mol L-1 sec-1)
.10 .10 1.0 x 10 ^ -3
.20 .10 2.0 x 10 ^ -3
.30 .10 3.0 x 10^ -3
.10 .20 1.0 x 10 ^-3
.10 .30 1.0 x 10 ^ -3

Rate expression (be sure to identify the unit of k):

If you have an initial concentration [(CH3)3CBr] of .45 and [OH] = .23, what is the initial rate of reaction?

Could you also add some explanation of how you got your answer so this could help me on tests that would be amazing! thank you!