AP Chemistry
6.8 Enthalpy of Formation
A student is determining the standard enthalpy of reaction, \(\Delta H_{\text{rxn}}^\circ\), for the complete combustion of liquid ethanol at \(298\text{ K}\) and \(1\text{ atm}\) represented by the balanced equation below.
\[ \text{C}_2\text{H}_5\text{OH}(l) + 3\,\text{O}_2(g) \rightarrow 2\,\text{CO}_2(g) + 3\,\text{H}_2\text{O}(l) \]
Which of the following substances in the reaction has a standard enthalpy of formation, \(\Delta H_f^\circ\), equal to \(0\text{ kJ/mol}\) at \(298\text{ K}\) and \(1\text{ atm}\)?
\[ \text{C}_2\text{H}_5\text{OH}(l) + 3\,\text{O}_2(g) \rightarrow 2\,\text{CO}_2(g) + 3\,\text{H}_2\text{O}(l) \]
Which of the following substances in the reaction has a standard enthalpy of formation, \(\Delta H_f^\circ\), equal to \(0\text{ kJ/mol}\) at \(298\text{ K}\) and \(1\text{ atm}\)?
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