# The rate constant for the reaction2A → Bis 7.55 × 10−3 s−1 at 110°C. The reaction is first order in A. How long (in seconds) will it take for [A] to decrease from 1.27 M to 0.510 M?

Question

The rate constant for the reaction

2A → B

is 7.55 × 10−3 s−1 at 110°C. The reaction is first order in A. How long (in seconds) will it take for [A] to decrease from 1.27 M to 0.510 M?