Question

ak home Scraping ice off the window of my car is no fun, how much heat would be required to melt 2-5 grams of ice using a hairblow dryer? Practice the following heat equation problems. 1. After a long day of school, your walk home 4. Scrap through the brisk fall air has given you the craving for hot chocolate. Calculate the Equation nece amount of heat necessary to warm 100 grams of milk from 100°C to 150 °C. (specific heat of milk - 3.89 J/g °C) Equation needed: 5. My favorite food dish requires me to boil water. Calculate the amount of heat needed to boil 11.8 grams of water. Equation needed: 2. Hot chocolate and cookies go hand in hand. The recipe requires that you melt 400 grams of butter. Calculate how much heat is required to melt the butter from a solid stick to a liquid. (Heat of Fusion 244J/8) Equation needed: 6. Many people like to relax in hot springs. Calculate the amount of heat released when 50 grams of 80°C water cools to 37 °C.. 3. Calculate the amount of heat released when 9.03 grams of water vapor condenses. Equation needed: Equation needed:

Answer 1

Heat required(9) = mass of nilk (m) x specitic heat f milk Ce) x temporatine change () 100x 3.89x(150-100) J = 19450J - 19.45 KJ 19.45 K 2. Heat quired = Mass of butter x heat of fusion of buter -400x2A4 = 97600 J 97.6 KJ 3 Heat d vaporisation of walb (4Hvab) . Heat of Condensation of wator 2264.705 J1 vapor= 2264 705 of wator vapor Condenses Heat releaseol when 9.03 9.03x2264 705 J 20 450 29 J 20.45 KJ 4, Heat of fueion of ice = 334 Jl Heat required to nult 2.5g of ice 2.5X 334 J 835J