Problem: How much energy would be absorbed or released by the H 2O in the process.30 grams H2O(g) at 100°C → 30 grams H2O(l) at 20°C?1. 16.2 kcal absorbed2. 16.2 kcal released3. There would be no transfer of energy due to the first law of thermodynamics4. 18.6 kcal released5. 2.4 kcal released  

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  • For this problem, we need to calculate the total energy released (since it changed from high to low T) for this following changes:

Q for liquid water from 100oC to 20oC (Q1)

Q for steam at 100oC to liquid water at 100oC (Q2)

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Problem Details

How much energy would be absorbed or released by the H 2O in the process.

30 grams H2O(g) at 100°C → 30 grams H2O(l) at 20°C?

1. 16.2 kcal absorbed

2. 16.2 kcal released

3. There would be no transfer of energy due to the first law of thermodynamics

4. 18.6 kcal released

5. 2.4 kcal released

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What scientific concept do you need to know in order to solve this problem?

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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