Chemistry

Chemistry

Problem

The following data are provided at 298 K298\,\text{K}. 1. H2(g)+12O2(g)→H2O(g)ΔH1=−242 kJH_{2}(g) + \tfrac{1}{2}O_{2}(g) \rightarrow H_{2}O(g) \qquad \Delta H_{1} = -242\,\text{kJ} 2. H2O(l)→H2O(g)ΔHvap=+44 kJH_{2}O(l) \rightarrow H_{2}O(g) \qquad \Delta H_{\text{vap}} = +44\,\text{kJ} 3. CO(g)+12O2(g)→CO2(g)ΔH3=−283 kJCO(g) + \tfrac{1}{2}O_{2}(g) \rightarrow CO_{2}(g) \qquad \Delta H_{3} = -283\,\text{kJ} A student wants the enthalpy change for CO(g)+12O2(g)+H2(g)→CO2(g)+H2O(l)CO(g) + \tfrac{1}{2}O_{2}(g) + H_{2}(g) \rightarrow CO_{2}(g) + H_{2}O(l) The student adds ΔH3\Delta H_{3} and ΔH1\Delta H_{1} and reports ΔHrxn=−525 kJ\Delta H_{\text{rxn}} = -525\,\text{kJ}. Which of the following is the correct value for ΔHrxn\Delta H_{\text{rxn}}? a) −481 kJ-481\,\text{kJ} b) −613 kJ-613\,\text{kJ} c) −569 kJ-569\,\text{kJ} d) −525 kJ-525\,\text{kJ}

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