For the decomposition equilibrium CaCO _3(s) CaO (s)+ CO _2(g)

CHEMISTRY · Single correct · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)

Problem

For the decomposition equilibrium CaCO3(s)⇌CaO(s)+CO2(g),\text{CaCO}_3(s) \rightleftharpoons \text{CaO}(s)+\text{CO}_2(g), which statement about the equilibrium-constant expression KcK_c is correct? (a) Kc=1[CO2]K_c=\dfrac{1}{[\text{CO}_2]} because the gas appears in the denominator when it is a product; the solids are omitted. (b) [CaO][\text{CaO}] and [CO2][\text{CO}_2] both appear in the expression, but [CaCO3][\text{CaCO}_3] is omitted. (c) Only [CO2][\text{CO}_2] appears in the expression because the concentrations of solids are omitted. (d) No species appear because the reaction contains solids; therefore Kc=1K_c=1.

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