7. A 183g piece of iron metal (CP,m= 25.10 J mol-1K-1) at a temperature of 255oC is placed in 500.0 mL of water (CP,sp= 4.186 J g-1oC-1) at 23.0 oC and the iron and water are allowed to come to thermal equilibrium. What is the final temperature of the water and the iron? Assume that the heat capacities of the water and iron are constant over this temperature range and that the density of water is 1.00 g per mL.

8. True or False: At any instant of time, more than half of the molecules in a sample of a pure gas at thermal equilibrium will have speeds greater than the root-mean-squared average speed.