QuestionMay 10, 2025

What is the Delta H_(rxn) for the following reaction? Hint: Use Table 10.3 (Page 430) in your textbook. 2NCl_(3)(g)arrow N_(2)(g)+3Cl_(2)(g) C -823kJ -117kJ -233kJ -475kJ -766kJ

What is the Delta H_(rxn) for the following reaction? Hint: Use Table 10.3 (Page 430) in your textbook. 2NCl_(3)(g)arrow N_(2)(g)+3Cl_(2)(g) C -823kJ -117kJ -233kJ -475kJ -766kJ
What is the Delta H_(rxn) for the following reaction? Hint: Use Table 10.3 (Page 430) in your textbook. 2NCl_(3)(g)arrow N_(2)(g)+3Cl_(2)(g) C -823kJ -117kJ -233kJ -475kJ -766kJ

Solution
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Answer

-233kJ Explanation 1. Identify the reaction enthalpy formula Use \Delta H_{rxn} = \sum \Delta H_f^{\circ}(\text{products}) - \sum \Delta H_f^{\circ}(\text{reactants}). 2. Gather necessary data Obtain standard enthalpies of formation (\Delta H_f^{\circ}) from Table 10.3 for NCl_3(g), N_2(g), and Cl_2(g). 3. Calculate products' enthalpy \Delta H_f^{\circ}(N_2(g)) + 3 \times \Delta H_f^{\circ}(Cl_2(g)). Note that \Delta H_f^{\circ}(Cl_2(g)) = 0 because it's a diatomic element in its standard state. 4. Calculate reactants' enthalpy 2 \times \Delta H_f^{\circ}(NCl_3(g)). 5. Compute \Delta H_{rxn} Subtract the sum of reactants' enthalpy from the sum of products' enthalpy using the values obtained.

Explanation

1. Identify the reaction enthalpy formula<br /> Use $\Delta H_{rxn} = \sum \Delta H_f^{\circ}(\text{products}) - \sum \Delta H_f^{\circ}(\text{reactants})$.<br /><br />2. Gather necessary data<br /> Obtain standard enthalpies of formation ($\Delta H_f^{\circ}$) from Table 10.3 for $NCl_3(g)$, $N_2(g)$, and $Cl_2(g)$.<br /><br />3. Calculate products' enthalpy<br /> $\Delta H_f^{\circ}(N_2(g)) + 3 \times \Delta H_f^{\circ}(Cl_2(g))$. Note that $\Delta H_f^{\circ}(Cl_2(g)) = 0$ because it's a diatomic element in its standard state.<br /><br />4. Calculate reactants' enthalpy<br /> $2 \times \Delta H_f^{\circ}(NCl_3(g))$.<br /><br />5. Compute $\Delta H_{rxn}$<br /> Subtract the sum of reactants' enthalpy from the sum of products' enthalpy using the values obtained.
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