Consider this equation in chemical equilibrium. cap c sub 2 cap h sub 4 g plus cap h sub 2 of g if and only if cap c sub 2 cap h sub 6 g plus 137 kJ What happens to the amount of ethane open paren cap c sub 2 cap h sub 6 close paren when the temperature of the system is increased?

Heat (137 kJ) appears on the product side, so the forward reaction that forms ethane is exothermic. Increasing the temperature adds heat, and the equilibrium shifts in the reverse direction to consume some of it. As a result, the amount of ethane decreases.

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