Multiple Choice
For which of the following chemical equations would the value of K_p equal K_c(RT)? (Note: K_c is sometimes called K.)
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16. Chemical Equilibrium
Kp and Kc
Multiple Choice
Partial pressures of the following equilibrium mixture at 955 K are: 130 torr methane, 92 torr hydrogen sulfide, 167 torr hydrogen gas and 532 torr carbon disulfide. What is the value of Kc at 955 K?
CH4(g) + 2 H2S(g) ⇌ 4 H2(g) + CS2(g)
A
1.1×10–4
B
1.3×10–5
C
8.3×10–3
D
1.0×10–2
Verified step by step guidance1
Identify the balanced chemical equation: CH₄(g) + 2 H₂S(g) ⇌ 4 H₂(g) + CS₂(g).
Write the expression for the equilibrium constant Kc in terms of concentrations: Kc = [H₂]⁴[CS₂] / ([CH₄][H₂S]²).
Convert the given partial pressures to concentrations using the ideal gas law: P = nRT/V, where concentration [C] = P/RT.
Substitute the concentrations into the Kc expression. Remember to raise each concentration to the power of its stoichiometric coefficient.
Calculate the value of Kc using the substituted concentrations, ensuring all units are consistent.
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