AP Chemistry
6.9 Hess’s Law
6.6 Introduction to Enthalpy of Reaction
6.5 Energy of Phase Changes
An industrial process produces ethanol vapor via the gas-phase hydration of ethene according to the following thermochemical equation:
\[\text{C}_2\text{H}_4(g) + \text{H}_2\text{O}(g) \rightarrow \text{C}_2\text{H}_5\text{OH}(g) \quad \Delta H^\circ = -45 \text{ kJ/mol}_{\text{rxn}}\]
In a modified reactor design, the product is continuously cooled and collected as liquid ethanol (\(\Delta H^\circ_{\text{condensation}} = -39 \text{ kJ/mol}\)). Which of the following best predicts the net enthalpy change, \(\Delta H^\circ_{\text{net}}\), for the production of \(1.0 \text{ mol}\) of liquid ethanol from gaseous ethene and steam, and provides the correct thermodynamic reasoning?
\[\text{C}_2\text{H}_4(g) + \text{H}_2\text{O}(g) \rightarrow \text{C}_2\text{H}_5\text{OH}(g) \quad \Delta H^\circ = -45 \text{ kJ/mol}_{\text{rxn}}\]
In a modified reactor design, the product is continuously cooled and collected as liquid ethanol (\(\Delta H^\circ_{\text{condensation}} = -39 \text{ kJ/mol}\)). Which of the following best predicts the net enthalpy change, \(\Delta H^\circ_{\text{net}}\), for the production of \(1.0 \text{ mol}\) of liquid ethanol from gaseous ethene and steam, and provides the correct thermodynamic reasoning?
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