Phase Change Calculations

Problem Set IconUsing your knowledge of phase change calculations, complete each of the problems below. Remember, to solve the phase change calculation, you must first convert the value to moles. Then, use either the heat of fusion or the heat of vaporization to complete the problem. Make sure to completely answer each question and to show all of your work.

This activity is available below or in printable version.

SteamUse either the heat of fusion or heat of vaporization to complete
each problem.

  1. How much energy would be required to melt 15.0 g of ice at 0 oC?
    ΔHfus= 6.00 kJ/mol

  2. How much energy would it take to boil 36.0 g of water at 100 oC?
    ΔHvap= 40.7 kJ/mol

  3. How many grams of steam could be condensed at 100 oC with the removal of 307 kJ of energy?
    ΔHvap= 40.7 kJ/mol

  4. How much energy is needed to make 254 g of iodine melt?
    ΔHfus= 7.76 kJ/mol

  5. How much energy is needed to make 4.24 g of lead melt?
    ΔHfus=4.77 kJ/mol

Assignment Icon
Once you have completed this assignment, please submit your work to the dropbox.