Calculate the heat of combustion of ethyl alcohol from the following data :
(i) Heat of formation of ethyl alcohol = -64.1 kcal
(ii) Heat of formation of water = -68.5 kcal
(iii) Heat of formation of CO2 =- 94.3 kcal.

Explanation

To calculate the heat of combustion of ethyl alcohol (C2H5OH), we can use the given heat of formation values for the reactants and products involved in the combustion reaction. The combustion of ethyl alcohol can be represented by the following balanced chemical equation:

\[ \text{C}_2\text{H}_5\text{OH} + 3\text{O}_2 \rightarrow 2\text{CO}_2 + 3\text{H}_2\text{O} \]

### Step-by-Step Solution:

1. **Identify the heat of formation values:**
- Heat of formation of ethyl alcohol (C2H5OH) = -64.1 kcal
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