For the gas-phase reaction , what is the specific unit of the equilibrium constant if partial pressu — Chemical Equilibrium Chemistry Question
Question
For the gas-phase reaction $CS_2(g) + 4H_2(g) \rightleftharpoons CH_4(g) + 2H_2S(g)$, what is the specific unit of the equilibrium constant $K_p$ if partial pressures are strictly measured in atmospheres?
Answer: B
💡 Solution & Explanation
The unit of $K_p$ is $(\text{atm})^{\Delta n_g}$. Here, $\Delta n_g = (\text{moles of gaseous products}) - (\text{moles of gaseous reactants}) = (1 + 2) - (1 + 4) = 3 - 5 = -2$. Therefore, the unit is $\text{atm}^{-2}$.
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