Question

The first-order decomposition of cyclopropane has a rate constant of 6.7 × 10-4 s-1. If the initial concentration of cyclopropane is 1.33 M, what is the concentration of cyclopropane after 644 s? A) 0.94 M B) 0.43 M C) 0.15 M D) 0.67 M E) 0.86 M