The reaction A → B + C is second order with respect to A. When [A]0 = 0.694 M, the reaction is 29.1 % complete at 62 min. Calculate the half-life for this reaction.

Because it was a dramatically big guy

The answer is the first option just took the test

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.