A100-g piece of metal initially at t = 75c is submerged in 100 g of water initially at t = 25c. the specific heat capacity of iron is 0.45 j g-1 °c-1 and the specific heat capacity of water is 4.18 j g-1 °c-1. what is the final temperature of both substances in c? a. 100 b. 75 c. 65 d. 30 e. 25