In the laboratory a student determines the specific heat of a metal. He heats 19.9 grams of iron to 98.00oC and then drops it into an insulated cup containing 83.5 grams of water at 21.15oC. When thermal equilibrium is reached, he measures the final temperature to be 23.14oC. Assuming that all of the heat is transferred to the water, he calculates the specific heat of iron to be ___ J/goC.