What Is the Concentration of B After 5 $\times$ 10^-3 Sec?
A)5

What is the concentration of B after 5 $\times$ 10^-3 sec?

A) 5.0 $\times$ 10^-5 M
B) 5.0 $\times$ 10^-4 M
C) 7.5 $\times$ 10^-4 M
D) 2.5 $\times$ 10^-4 M
E) none of these