Standard molar enthalpy of formation of `CO_(2)` is equal to `:`

Options

A. Zero
B. The standard molar enthalpy of combustion of gaseous carbon.
C. The sun of standard molar enthalpies of formation of `CO` and `O_(2)`.
D. The standard molar enthalpy of combustion of carbon (graphite)

Explanation

To determine the standard molar enthalpy of formation of carbon dioxide (CO₂), we can follow these steps:

### Step 1: Understand the Definition
The standard molar enthalpy of formation (ΔH_f°) of a compound is defined as the change in enthalpy when one mole of the compound is formed from its elements in their standard states.

### Step 2: Identify the Elements and Their Standard States
For carbon dioxide (CO₂), the elements involved are carbon (C) and oxygen (O). The standard state of carbon is graphite (C), and the standard state of oxygen is O₂ gas.

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