The specific heat of iron is 0.4494 j/g°c. how much heat energy (kj) is transferred when a 24.7 kg iron ingot is cooled from 880°c to 13°c?

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ