1. Determine the number of calories needed to change 28 g of water at 25 °C into steam at 100 °C.
2. The force between two 4.11 x 10^-4 C charges that are 4.11 meters apart is ____ N.
3. The amount of heat released when 3.5 grams of steam at 100 degrees Celsius is converted into liquid water at 100 degrees Celsius is ____ J.
4. You need to add ____ J of heat to raise the temperature of 110 grams of water by 16 degrees Celsius.