The reaction A(g) B(g) + C(g) is known to be first order in A(g). It takes

Question:

The reaction A(g) → B(g) + C(g) is known to be first order in A(g). It takes 25 s for the concentration of A(g) to decrease by one-half of its initial value. How long does it take for the concentration of A(g) to decrease to one-fourth of its initial value? to one-eighth of its initial value?