AP Chemistry
6.9 Hess’s Law
6.8 Enthalpy of Formation
6.6 Introduction to Enthalpy of Reaction
Glycerol, \(\text{C}_3\text{H}_8\text{O}_3\text{(l)}\), is an organic byproduct of biodiesel production that can be utilized as a liquid fuel. The table below provides standard enthalpies of formation, \(\Delta H^\circ_f\), at \(298\text{ K}\).
Based on the data in the table, what is the standard enthalpy of combustion, \(\Delta H^\circ_{\text{comb}}\), for liquid glycerol at \(298\text{ K}\)?
| Substance | \(\Delta H^\circ_f\ (\text{kJ/mol})\) |
|---|---|
| \(\text{C}_3\text{H}_8\text{O}_3\text{(l)}\) | \(-668\) |
| \(\text{CO}_2\text{(g)}\) | \(-394\) |
| \(\text{H}_2\text{O(l)}\) | \(-286\) |
| \(\text{H}_2\text{O(g)}\) | \(-242\) |
| \(\text{O}_2\text{(g)}\) | \(0\) |
Based on the data in the table, what is the standard enthalpy of combustion, \(\Delta H^\circ_{\text{comb}}\), for liquid glycerol at \(298\text{ K}\)?
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