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Unformatted text preview: ) ΔHof / kJ∙mol−1 3. What is the standard molar enthalpy of combustion for CO2(g) –393.5 benzoic acid? 3 points H2O(l) –285.8 C6H5COOH(s) –385.1 C6H5COOH(s) + 15/2O2(g) → 7CO2(g) + 3H2O(l) o
ΔH rxn = ∑ nΔH o ( products ) − ∑ mΔH o ( reactants )
= 7 ( ΔH o ( CO2 ) ) + 3 ( ΔH o ( H 2 O ) ) − ( ΔH o ( C6 H 5 COOH ) )
f = 7 mol ( −393.5 kJ ⋅ mol−1 ) + 3 mol ( −285.8 kJ ⋅ mol−1 ) − ( −385.1 kJ ⋅ mol−1 ) = −3226.8 kJ ⋅ mol−1 Enthalpy This combustion is EXOTHERMIC / ENDOTHERMIC and the change in enthalpy of the reactants is GREATER THAN / LESS THAN the change in enthalpy of the products. (Circle one for each set.) 2 points 4. The standard molar enthalpy of C
solution for ammonium nitrate is endothermic. Show this on an energy diagram. 2 points Products
Using the letters – what is the change B
in enthalpy for the forward reaction Reactants
and for the reverse reaction? A Reac on Progress...
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