At a fixed temperature the reversible reaction H_2(g) + I_2(g) ; ;2 , HI(g) is…

CHEMISTRY · Multi-part · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)

Problem

At a fixed temperature the reversible reaction

\mathrm{H_2(g)}+\mathrm{I_2(g)}\;\rightleftharpoons\;2\,\mathrm{HI(g)}

is allowed to reach equilibrium in a 1.50 L container. A particulate diagram shows 30 H₂ molecules, 30 I₂ molecules, and 120 HI molecules. No other species are present. Each particle corresponds to

5.00\times10^{20}

molecules of the substance it represents;

N_{A}=6.022\times10^{23}\,\text{mol}^{-1}

. (a) Write the equilibrium-constant expression

K_c

for the reaction. (b) Calculate the numerical value of

K_c

for this system at the stated temperature. Show all work with appropriate significant figures. (c) Based on the magnitude of

K_c

, state whether products or reactants are favored at equilibrium and briefly justify your conclusion.

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