Which would pact to have the higher fusion enthalpy N_0 Explain your choice. The
ID: 1017313 • Letter: W
Question
Which would pact to have the higher fusion enthalpy N_0 Explain your choice. The fusion enthalpy for H_20 is about 2.5 times larger than the fusion enthalpy for H_2S. What does this say about the relative strengths of the forces between the molecules in these two solids? Explain. Calculate the total heat energy transfer required to change 0.50 mol ice at -5 degree C to 0.50 mol steam at 100 degree C. The solid ice and liquid water have heat capacities of 2.06 J g^-1 degree C^-1 and 4.184 Jg^-1 C^1. respectively. The fusion enthalpy for solid ice is 6.02 kJ/mol and the vaporization enthalpy of liquid water is 40.7 kJ/mol. Calculate the heat energy transfer needed to melt a 36.00-g ice cube that is initially at -10 degree C and bring it to room temperature (20 degree C). (See Question 35 for data.)Explanation / Answer
36. Raise 36.0 g of ice from -10.0 to zero Celsius:
(36.0 g) (0-(-10.0 K)) (2.06 J g¯1 K¯1) = 741.6 J = 0.7416 kJ
melt 36.0 g of ice:
(6.02 kJ/mol) (36.0 g / 18.0 g/mol) = 12.04 kJ
raise 36.0 g of liquid water from zero to 20.0 Celsius:
(36.0 g) (20.0 °C) (4.184 J g¯1 °C¯1) = 3012.48 J = 3.01248 kJ
add the results:
0.7416 + 12.04 + 3.01248 kJ = 15.79 kJ = heat energy transfer needed
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