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Equilibrium constants are known for the following reactions:
S(s)+ 3/2O2(g)
SO3(g)Kc = 9.2 * 1023
SO3(g)
SO2(g)+ 1/2O2(g)Kc = 4.8 *10- 4
Thus, for the reaction S(s)+ O2(g)
SO2(g), Kc = 4.4 * 1020.
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