c) Use Hess's law to calculate the amount of heat involved in converting 25.00 g of liquid water at 25° to steam at 100°

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**Hess's Law Heat Calculation**

**Problem Statement:**
Use Hess's law to calculate the amount of heat involved in converting 25.00 g of liquid water at 25°C to steam at 100°C.

**Explanation:**

- **Hess's Law:** A principle in chemistry that states the total enthalpy change for a reaction is the same, no matter how many steps it is carried out in. This law is particularly useful for calculating the heat involved in chemical reactions that occur over multiple stages.

- **Objective:** Calculate the total heat required to convert 25.00 grams of liquid water at 25°C to steam at 100°C. 

- **Steps Involved:**
  1. **Heating Water from 25°C to 100°C:**
     - This step involves increasing the water temperature without changing its state. The specific heat capacity of water is needed to calculate the heat required.
  
  2. **Phase Change from Liquid to Gas:**
     - Once the water reaches 100°C, additional heat is needed for the phase change from liquid to gas (steam). The heat of vaporization for water will be used in this calculation.

This exercise illustrates the application of Hess's Law in determining heat changes for processes that involve temperature change and phase transitions.
Transcribed Image Text:**Hess's Law Heat Calculation** **Problem Statement:** Use Hess's law to calculate the amount of heat involved in converting 25.00 g of liquid water at 25°C to steam at 100°C. **Explanation:** - **Hess's Law:** A principle in chemistry that states the total enthalpy change for a reaction is the same, no matter how many steps it is carried out in. This law is particularly useful for calculating the heat involved in chemical reactions that occur over multiple stages. - **Objective:** Calculate the total heat required to convert 25.00 grams of liquid water at 25°C to steam at 100°C. - **Steps Involved:** 1. **Heating Water from 25°C to 100°C:** - This step involves increasing the water temperature without changing its state. The specific heat capacity of water is needed to calculate the heat required. 2. **Phase Change from Liquid to Gas:** - Once the water reaches 100°C, additional heat is needed for the phase change from liquid to gas (steam). The heat of vaporization for water will be used in this calculation. This exercise illustrates the application of Hess's Law in determining heat changes for processes that involve temperature change and phase transitions.
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