A first order reaction is 50% complete in 30 minutes, what is the rate constant?

0.231 min-1 0.0231 min-1 2.31 min-1 23.1 min-1

0.0231 min-1

t\(\frac{1}{2}\) = \(\frac{0.693}{k}\) k = \(\frac{0.693}{30}\) = 0.0231 min-1