Is very slow in the absence of a catalyst. the reaction is second order and the rate constant at room temperature is 2.6x10−7 mol−1 l s−1. if 1.0 l of a 0.1 m solution of hydrogen peroxide is placed in a container, how long will it take for the solution to produce 1 l (0.0446 mol) of o2(g)?

The answer to this question is a

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.