Two elementary equilibria are given below at the same temperature

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

Problem

Two elementary equilibria are given below at the same temperature. (1) X ⇌\rightleftharpoons Y K1=2.0×103K_1 = 2.0\times10^{3} (2) Y ⇌\rightleftharpoons Z K2=5.0×10−2K_2 = 5.0\times10^{-2} Which of the following best represents the magnitude of the equilibrium constant KoverallK_{\text{overall}} for the reaction X ⇌\rightleftharpoons Z obtained by adding reactions (1) and (2)? (a) Koverall≈2.0×103K_{\text{overall}} \approx 2.0\times10^{3} (b) Koverall≈2.5×101K_{\text{overall}} \approx 2.5\times10^{1} (c) Koverall≈1.0×102K_{\text{overall}} \approx 1.0\times10^{2} (d) Koverall≈1.0×106K_{\text{overall}} \approx 1.0\times10^{6}

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