chem questions

Calorimetry challenge: How much heat is required to raise the temperature of 2.50 kg of iron from 20oC to 1700oC?

For iron: MP = 1535oC; ∆Hºfus = 247 J/g ; csolid = 0.449 J/gºC; cliquid = 0.824 J/gºC

I got 1.85 x 10^5. Could you check this?


You are asked to prepare a temperature bath that freezes at -12.5ºC using only water (Kf = 1.86 ºC/molal) and ammonium sulfate. How many grams of ammonium sulfate would you need in order to prepare this bath if you start with 500 g of water?