Problem: Assume that the values given here for 1 mole of benzene are constant over the relevant temperature ranges.Melting point5.4 oCBoiling point80.1 oCΔHfus9.9 kJ/molΔHvap30.7 kJ/molCs,solid118 J/mol • KCs,liquid135 J/mol • KCs,gas104 J/mol • KDraw a heating curve for 1 mol of benzene beginning at 0 °C and ending at 100 °C, and use it to answer the questions.What is the qsolid value for 1 mole of benzene?

FREE Expert Solution

There are four heats involved in this problem:

1. q1 which is the heat in raising the temperature of 1 mole of benzene from 0 ˚C to 5.4 ˚C

2. q2 which is the heat in melting 1 mole of benzene at 5.4 ˚C

3. q3 which is the heat in raising the temperature of 1 mole of benzene from 5.4 ˚C to 80.1 ˚C

2. q4 which is the heat in evaporating 1 mole of benzene at 80.1 ˚C

3. q5 which is the heat in raising the temperature of 1 mole of benzene from 80.1 ˚C to 100.0 ˚C


We need to solve for qsolid, benzene is solid from 0 ˚C to 5.4 ˚C, thus qsolid = q1.


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Problem Details
Assume that the values given here for 1 mole of benzene are constant over the relevant temperature ranges.
Melting point5.4 oC
Boiling point80.1 oC
ΔHfus9.9 kJ/mol
ΔHvap30.7 kJ/mol
Cs,solid118 J/mol • K
Cs,liquid135 J/mol • K
Cs,gas104 J/mol • K


Draw a heating curve for 1 mol of benzene beginning at 0 °C and ending at 100 °C, and use it to answer the questions.

What is the qsolid value for 1 mole of benzene?

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Our tutors have indicated that to solve this problem you will need to apply the Heating and Cooling Curves concept. You can view video lessons to learn Heating and Cooling Curves. Or if you need more Heating and Cooling Curves practice, you can also practice Heating and Cooling Curves practice problems.

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