Predict the enthalpy change due to the combustion of 11.7 g of propane in a barbeque. The molar enthalpy of combustion of propane is -2043.9 kJ/mol

To predict the enthalpy change due to the combustion of 11.7 g of propane, we'll use the molar enthalpy of combustion and the molar mass of propane. 

Here's the step-by-step calculation:

1. **Determine the molar mass of propane (C₃H₈):**
   - Carbon (C): \( 12.01 \, \text{g/mol} \times 3 = 36.03 \, \text{g/mol} \)
   - Hydrogen (H): \( 1.01 \, \text{g/mol} \times 8 = 8.08 \, \text{g/mol} \)
   - Molar mass of propane \( = 36.03 \, \text{g/mol} + 8.08 \, \text{g/mol} = 44.11 \, \text{g/mol} \)

2. **Calculate the number of moles of propane in 11.7 g:**
   \[
   \text{moles of propane} = \frac{11.7 \, \text{g}}{44.11 \, \text{g/mol}} \approx 0.2655 \, \text{mol}
   \]

3. **Use the molar enthalpy of combustion to find the total enthalpy change:**
   - Molar enthalpy of combustion of propane \( = -2043.9 \, \text{kJ/mol} \)
   \[
   \text{Enthalpy change} = 0.2655 \, \text{mol} \times (-2043.9 \, \text{kJ/mol}) \approx -542.7 \, \text{kJ}
   \]

Thus, the enthalpy change due to the combustion of 11.7 g of propane is approximately **-542.7 kJ**.

Would you like further details or have any questions?

Here are some related questions:
1. How does the enthalpy change of combustion vary with different hydrocarbons?
2. What is the significance of a negative enthalpy change in combustion reactions?
3. How would the enthalpy change differ if the propane was not fully combusted?
4. What role does the molar mass play in determining the enthalpy change of a substance?
5. How is the enthalpy of combustion measured experimentally?

**Tip:** Always ensure that the chemical equation is balanced when dealing with enthalpy changes for reactions.

Learn how to predict the enthalpy change due to the combustion of 11.7 g of propane using the molar enthalpy of combustion and molar mass calculations. Detailed step-by-step solution with formula application. Suitable for advanced high school students studying chemistry.

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