1. How many kJ of heat are required to melt a 10.0 g popsicle at 0 C. Assume the popsicle has the same molar mass and heat of fusion of water. SubstanceΔH fus (kJ/mol)ΔH vap (kJ/mol) Ammonia (NH 3 )5.6523.4 Ethanol (C 2 H 5 OH)4.6043.5 Hydrogen (H 2 )0.120.90 Methanol (CH 3 OH)3.1635.3 Oxygen (O 2 )0.446.82 Water (H 2 O)6.0140.7

2. How much heat is absorbed when 63.7 g H 2 O (l) at 100° C and 1 atm is converted to steam at 100 ° C? SubstanceΔH fus (kJ/mol)ΔH vap (kJ/mol) Ammonia (NH 3 )5.6523.4 Ethanol (C 2 H 5 OH)4.6043.5 Hydrogen (H 2 )0.120.90 Methanol (CH 3 OH)3.1635.3 Oxygen (O 2 )0.446.82 Water (H 2 O)6.0140.7

3. How many grams of H2O (l) at 100°C are converted to steam at 100°C when 56.1 kJ of heat is absorbed? SubstanceΔH fus (kJ/mol)ΔH vap (kJ/mol) Ammonia (NH 3 )5.6523.4 Ethanol (C 2 H 5 OH)4.6043.5 Hydrogen (H 2 )0.120.90 Methanol (CH 3 OH)3.1635.3 Oxygen (O 2 )0.446.82 Water (H 2 O)6.0140.7

4. How many grams of ice at 0°C could be melted by the addition of 0.400 kJ of heat? SubstanceΔH fus (kJ/mol)ΔH vap (kJ/mol) Ammonia (NH 3 )5.6523.4 Ethanol (C 2 H 5 OH)4.6043.5 Hydrogen (H 2 )0.120.90 Methanol (CH 3 OH)3.1635.3 Oxygen (O 2 )0.446.82 Water (H 2 O)6.0140.7

5. SubstanceΔH f 0 (kJ/mol) Br 2 (g) 30.91CO 2 (g) -393.5 Br 2 (l) 0NO (g) 90.37 CaCO 3(s) -1207.0O 2 (g) 0.0 CaO (s) -635.1NO 2 (g) 33.85 SubstanceΔH f 0 (kJ/mol)