Problem: The molar heat capacity of some molecule X(l) is 10 cal/K · mol, its heat of vaporization is 5000 cal/mol and its boiling point is 75◦C. For the conversion of one mol of X(g) at 75◦C to one mol of X(l) at 60◦C, 1. 5150 cal of heat are released by X.  2. 4850 cal of heat are released by X. 3. 150 cal of heat are released by X. 4. 4850 cal of heat are absorbed by X. 5. 5150 cal of heat are absorbed by X.

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Problem Details

The molar heat capacity of some molecule X(l) is 10 cal/K · mol, its heat of vaporization is 5000 cal/mol and its boiling point is 75C. For the conversion of one mol of X(g) at 75C to one mol of X(l) at 60C,

1. 5150 cal of heat are released by X. 

2. 4850 cal of heat are released by X.

3. 150 cal of heat are released by X.

4. 4850 cal of heat are absorbed by X.

5. 5150 cal of heat are absorbed by X.

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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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Based on our data, we think this problem is relevant for Professor Sutcliffe's class at TEXAS.