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
Frequently Asked Questions
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.
What is the difficulty of this problem?
Our tutors rated the difficulty ofHow much energy would be absorbed or released by the H 2O in...as medium difficulty.
What professor is this problem relevant for?
Based on our data, we think this problem is relevant for Professor Walker's class at TEXAS.