Use the standard enthalpies of formation and calculation the enthalpy changes accompanying the following reaction:
a. `CH_(4)(g)+2O_(2)(g) rarr CO_(2)(g)+2H_(2)O(l)`
Given, enthalpies of formation of `CH_(4) ,CO_(2) `and `H_(2)O` are `74.8 kJmol^(-1) ,−393.5 kJmol^(−1) ,−286 kJmol^(−1)` respectively.

Explanation

To calculate the enthalpy change (ΔH) for the reaction

\[ \text{CH}_4(g) + 2\text{O}_2(g) \rightarrow \text{CO}_2(g) + 2\text{H}_2\text{O}(l) \]

we will use the standard enthalpies of formation (ΔHf) of the reactants and products.

### Step-by-Step Solution:

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