What will the final temperature be if you add 400 KJ of heat to 1.00 L of liquid water at 20°C? The density of water is 1.00 %/mL at this temperature. The specific heats of liquid and gaseous water are 4.18 and 1.84 J/g.K, and the enthalpy of vaporization is 40.67 KJ/mol. A. 136.4°C OB. 100°C C. 115.7°C D. 95.7°C E. 20.1°C

Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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**Question:**

What will the final temperature be if you add 400 KJ of heat to 1.00 L of liquid water at 20°C? The density of water is 1.00 g/mL at this temperature. The specific heats of liquid and gaseous water are 4.18 and 1.84 J/g·K, and the enthalpy of vaporization is 40.67 KJ/mol.

**Options:**

- A. 136.4°C
- B. 100°C
- C. 115.7°C
- D. 95.7°C
- E. 20.1°C

Choice C is selected.

**Feedback:**

That's incorrect.

If 400 KJ of heat is added to 1.00 L of water, we would expect the temperature to rise by 95.7°C in the absence of any phase transitions. Since we started at 20°C, you might think the final temperature will be 115.7°C, but you’ve failed to account for the fact that water will start to boil once the temperature reaches 100°C.
Transcribed Image Text:**Question:** What will the final temperature be if you add 400 KJ of heat to 1.00 L of liquid water at 20°C? The density of water is 1.00 g/mL at this temperature. The specific heats of liquid and gaseous water are 4.18 and 1.84 J/g·K, and the enthalpy of vaporization is 40.67 KJ/mol. **Options:** - A. 136.4°C - B. 100°C - C. 115.7°C - D. 95.7°C - E. 20.1°C Choice C is selected. **Feedback:** That's incorrect. If 400 KJ of heat is added to 1.00 L of water, we would expect the temperature to rise by 95.7°C in the absence of any phase transitions. Since we started at 20°C, you might think the final temperature will be 115.7°C, but you’ve failed to account for the fact that water will start to boil once the temperature reaches 100°C.
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