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