Q.

At a certain temperature, the following reactions have the equilibrium constants as shown below: S(s)+O2(g)⇌SO2(g); Kc=5×1052 2 S(s)+3O2(g)⇌2SO3(g);Kc=1029What is the equilibrium constant Kc for the reaction at the same temperature ? 2SO2(g)+O2(g)⇌2SO3(g)

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2.5×1076

4×1023

4×10-77

None of these

answer is C.

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Detailed Solution

S(s)+O2(g)⇌SO2(g); Kc=5×1052 ---(1) 2 S(s)+3O2(g)⇌2SO3(g);Kc=1029 ---(2) Kc for the reaction 2SO2(g)+O2(g)⇌2SO3(g) ---(3) is(3)=2×1(1)+(2)∴For(3), Kc=15×10522×1029 =4×10-77

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