PCl3(g) + Cl2(g)  PCl5(g), Kc = 26 at 250°C. 1.0 mol of PCl3, 1.0 mol of Cl2, and 5.0 mol of PCl5 are placed in a 10.0 L flask at 250°C and allowed to come to equilibrium. What is the concentration of Cl2 at equilibrium?

A5 mole sample of liquid acetone is converted to a gas at 75.0°c. if 628 j are required to raise the temperature of the liquid to the boiling point, 15.600 kj are required to evaporate the liquid, and 712 j are required to raise the final temperature to 75.0°c, what is the total energy required for the conversion?