# Water Chemistry , chemistry homework help

For this assignment, you are to set up the steps and show the work which should equal the answers provided.

Unit 3 Lesson 5: Water Apply

Vaporization. Make sure that you are showing each step of your work.

1. How much energy is absorbed when 30.3 g of liquid water boils? answer= 68.5kj

2. An energy unit often encountered is the calorie (4.18 J = 1 calorie). Determine the molar enthalpy of fusion of ice in calories per gram. answer = 79.8 cal/g

3. A typical ice cube has a volume of about 16.0 mL. Calculate the amount of energy needed to melt the ice cube. (Density of ice at 0.°C 0.917 g/mL; molar enthalpy of fusion of ice 6.009 kJ/mol;molar mass of H2O 18.02 g/mol.)

Determine the mass of the ice cube. answer = 14.7g

Determine the number of moles of H2O present in the sample. answer = 0.814 mol

Determine the number of kilojoules of energy needed to melt the ice cube. answer = 4.89kj

“Make sure to show your work, and your answers should be provided with the correct amount of significant figures.”