C2h4(g) + h2(g) mc009-1.jpg c2h6(g) + 137 kj what happens to the amount of ethane (c2h6) when the temperature of the system is increased? the amount of ethane decreases. the amount of ethane increases initially and then decreases. the amount of ethane increases. the amount of ethane decreases initially and then increases.

Answer is: the amount of ethane decreases.
This reaction is exothermic, which means that heat is released. According to Le Chatelier's principle when the reaction is exothermic heat is included as a product and when the temperature increased, the heat of the system increase, so the system consume some of that heat by shifting the equilibrium to the left,  producing less ethane.