Given \( \left[\mathrm{CS}_{2}\right]=0.120 \mathrm{M},\left[\mathrm{H}_{2}\right]=0.10 \mathrm{...

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Given \( \left[\mathrm{CS}_{2}\right]=0.120 \mathrm{M},\left[\mathrm{H}_{2}\right]=0.10 \mathrm{M},\left[\mathrm{H}_{2} \mathrm{~S}\right]=0.20 \mathrm{M} \) and \( \left[\mathrm{CH}_{4}\right]=8.40 \times 10^{-5} M \) for the following reaction at \( 900^{\circ} \mathrm{C} \), at eq. Calculate the equilibrium constant \( \left(K_{c}\right) \).
\( \mathrm{CS}_{2}(g)+4 \mathrm{H}_{2}(g) \rightleftharpoons \mathrm{CH}_{4}(g)+2 \mathrm{H}_{2} \mathrm{~S}(g) \)
(a) \( 0.0120 \)
(b) \( 0.0980 \)
(c) \( 0.280 \)
(d) \( 0.120 \)
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