13.00 g of Compound X with molecular formula C,H, are burned in a constant-pressure calorimeter containing 20.00 kg of water at 25 °C. The temperature of the water is observed to rise by 6.645 °C. (You may assume all the heat released by the reaction is absorbed by the water, and none by the calorimeter itself.) Calculate the standard heat of formation of Compound X at 25 °C. Be sure your answer has a unit symbol, if necessary, and round it to 3 significant digits.

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**Calorimetry and Heat of Formation Calculation**

In an experiment to determine the heat of formation of a compound, 13.00 g of Compound \( X \), with the molecular formula \( \text{C}_5\text{H}_6 \), are burned. This reaction takes place in a constant-pressure calorimeter containing 20.00 kg of water at an initial temperature of 25 °C. Following the combustion, the water temperature rises by 6.645 °C.

**Problem Statement:**
Calculate the standard heat of formation of Compound \( X \) at 25 °C. Assume all the heat released by the reaction is absorbed by the water, not by the calorimeter.

**Instructions:**
- Ensure your answer includes a unit symbol.
- Round the answer to three significant digits.

**Answer Input:**
A text box is provided for entering the answer, accompanied by a set of mathematical symbols and tools for calculations. 

The interface includes:
- A numerical keypad with a layout to assist in scientific calculations.
- Buttons for submitting the answer or seeking hints.

**Tools Available:**
- Explanation tool for detailed solution steps.
- Check button to verify the accuracy of your provided answer.
Transcribed Image Text:**Calorimetry and Heat of Formation Calculation** In an experiment to determine the heat of formation of a compound, 13.00 g of Compound \( X \), with the molecular formula \( \text{C}_5\text{H}_6 \), are burned. This reaction takes place in a constant-pressure calorimeter containing 20.00 kg of water at an initial temperature of 25 °C. Following the combustion, the water temperature rises by 6.645 °C. **Problem Statement:** Calculate the standard heat of formation of Compound \( X \) at 25 °C. Assume all the heat released by the reaction is absorbed by the water, not by the calorimeter. **Instructions:** - Ensure your answer includes a unit symbol. - Round the answer to three significant digits. **Answer Input:** A text box is provided for entering the answer, accompanied by a set of mathematical symbols and tools for calculations. The interface includes: - A numerical keypad with a layout to assist in scientific calculations. - Buttons for submitting the answer or seeking hints. **Tools Available:** - Explanation tool for detailed solution steps. - Check button to verify the accuracy of your provided answer.
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