Chemistry

Problem

Consider the following equilibria at 298 K. I.

\mathrm{A(g)\leftrightharpoons B(g)},\;K_1 = 2.5 \times 10^{3}

II.

\mathrm{B(g)\leftrightharpoons C(g)},\;K_2 = 4.0 \times 10^{-2}

III.

\mathrm{C(g)\leftrightharpoons D(g)},\;K_3 = 3.0 \times 10^{7}

IV.

\mathrm{A(g)\leftrightharpoons D(g)}

(overall reaction) Which ranking places reactions I–IV in order of decreasing extent of completion toward products? a)

\text{III} > \text{IV} > \text{I} > \text{II}

\text{IV} > \text{I} > \text{III} > \text{II}

\text{IV} > \text{III} > \text{I} > \text{II}

\text{III} > \text{I} > \text{IV} > \text{II}