21. Consider the following reaction: $\text{CS}2(g) + 4\text{H}2(g) \rightleftharpoons \text{CH}4(g) + 2\text{H}2\text{S}(g)$. The equilibrium constant $K$ is about 0.31 at 900°C. What is the $K_p$ at this temperature?
(A) $2.9 \times 10^3$
(B) $3.2 \times 10^{-3}$
(C) $3.3 \times 10^{-5}$
(D) $3.0 \times 10^1$
(E) $1.1 \times 10^{-3}$

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