delta e = delta h at constap p - P delta v Is this as simple as reasoning that if the number of moles are the same then an example a, E equals H,    in b Number of moles  hence the volume goes down so h greater than e

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Chapter1: Chemical Foundations
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delta e = delta h at constap p - P delta v

Is this as simple as reasoning that if the number of moles are the same then an example a, E equals H, 

 

in b Number of moles  hence the volume goes down so h greater than e ?  Not sure

**49.** For the process \( \text{H}_2\text{O}(l) \rightarrow \text{H}_2\text{O}(g) \) at 298 K and 1.0 atm, \( \Delta H \) is more positive than \( \Delta E \) by 2.5 kJ/mol. What does the 2.5 kJ/mol quantity represent?

**50.** For the following reactions at constant pressure, predict if \( \Delta H > \Delta E, \Delta H < \Delta E, \) or \( \Delta H = \Delta E \).

- a. \( 2\text{HF}(g) \rightarrow \text{H}_2(g) + \text{F}_2(g) \)
- b. \( \text{N}_2(g) + 3\text{H}_2(g) \rightarrow 2\text{NH}_3(g) \)
- c. \( 4\text{NH}_3(g) + 5\text{O}_2(g) \rightarrow 4\text{NO}(g) + 6\text{H}_2\text{O}(g) \)

**Calorimetry and Heat Capacity**

**51.** Consider the substances in Table 6.1. Which substance requires the largest amount of energy to raise the temperature of 250 g of the substance from 15.0°C to 37.0°C? Calculate the amount of energy. Which substance in Table 6.1 has the largest temperature change?
Transcribed Image Text:**49.** For the process \( \text{H}_2\text{O}(l) \rightarrow \text{H}_2\text{O}(g) \) at 298 K and 1.0 atm, \( \Delta H \) is more positive than \( \Delta E \) by 2.5 kJ/mol. What does the 2.5 kJ/mol quantity represent? **50.** For the following reactions at constant pressure, predict if \( \Delta H > \Delta E, \Delta H < \Delta E, \) or \( \Delta H = \Delta E \). - a. \( 2\text{HF}(g) \rightarrow \text{H}_2(g) + \text{F}_2(g) \) - b. \( \text{N}_2(g) + 3\text{H}_2(g) \rightarrow 2\text{NH}_3(g) \) - c. \( 4\text{NH}_3(g) + 5\text{O}_2(g) \rightarrow 4\text{NO}(g) + 6\text{H}_2\text{O}(g) \) **Calorimetry and Heat Capacity** **51.** Consider the substances in Table 6.1. Which substance requires the largest amount of energy to raise the temperature of 250 g of the substance from 15.0°C to 37.0°C? Calculate the amount of energy. Which substance in Table 6.1 has the largest temperature change?
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