A calorimeter contains 500 g of water at 25°C. You place a cold pack containing 100 g of crystalline ammonium nitrate inside the calorimeter. When the ammonium nitrate finishes dissolving, the temperature of the water inside the calorimeter is 9.3°C. The specific heat of water is 4.18 J/g–°C. What is the enthalpy of fusion (ΔHf) of the ammonium nitrate? Show your work. Where necessary, use q = mHf. Compare and contrast positrons with electrons. Explain how positron emission works and how it causes transmutations. Explain how electron capture works and how it causes transmutations. Compare the transmutations caused by positron emissions and electron capture.