For an experiment you have a calorimeter with 350 g of

Question

If you could show how to solve these questions that would be great.

1. For an experiment, you have a calorimeter with 350 g of water at 24°C. 175 g of crystalline ammonium nitrate from a cold pack is placed into the calorimeter. When the ammonium nitrate finishes dissolving in the water, the temperature of the water inside the calorimeter is 5.5°C. The total mass of the solution is 525 g and the specific heat of the solution is 4.18 J/g °C (the same as water). What is the enthalpy of dissolving (ΔH_dissolving) of in J/g ammonium nitrate?
2. During the testing of a new car engine, researchers found the engine produced 45,400 kJ of heat when run for an hour. The antifreeze system has a capacity of 8.45 L and is filled with an antifreeze mixture (specific heat of 8.65 J/g °C, density of 1.027 g/mL). The purpose of the antifreeze system is to help keep the engine cool, and in this experimental test, the engine temperature changed from 85°C to 101°C. During this hour long experiment, how many times did the cooling system turn over its volume of antifreeze to keep the engine temperature steady?