🤓 Based on our data, we think this question is relevant for Professor Walker's class at TEXAS.
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)
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