At and 1 atm pressure, the enthalpies of combustion are as given below:

| Substance | | C (graphite) | |
|-----------|------|------|------|
| | | | |

The enthalpy of formation of ethane is:

Question

At  and 1 atm pressure, the enthalpies of combustion are as given below:

| Substance |  | C (graphite) |  |
|-----------|------|------|------|
|  |  |  |  |

The enthalpy of formation of ethane is:

Canvas Classes · Accepted Answer

Strategy:
 Define the standard enthalpy of formation as the energy change when  mole of a compound is formed from its elements in their standard states. Apply Hess's Law using combustion data.

Step 1: Write the formation reaction

Step 2: Apply Hess's Law (Combustion route)

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