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What is the rate law for the uncatalyzed reaction?

The half-life of a certain element is 100 days. how many half-lives will it be before only one eighth of this elementremains?

When the reaction 2h2s(g) 2h2(g) + s2(g) is carried out at 1065°c, kp = 0.012. starting with pure h2s at 1065°, what must the initial pressure of h2s be if the equilibrated mixture at this temperature is to contain 0.250 atm of h2(g)?