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Predict the direction in which the reaction will shift for the following reactions if the temperature is decreased (heat is removed):
a)SO3 + NO ⇔ SO2 + NO2 (endothermic)
b)CH4 + H2O ⇔ CO + H2 (endothermic)
c)N2 + 3H2 ⇔ 2NH3 (exothermic)
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