The Reaction a - B Is First Order in [A]

Multiple Choice

The reaction A - B is first order in [A]. Consider the following data.
-The concentration of A is M after 40.0 s.

A) 3.5 × 10^{- 4}
B) 0.025
C) 0.17
D) 1.2
E) 1.2 × 10^{- 2}