Given:
ΔHo rxn = -2471.8 KJ/mol
Hof(O2(g)) = 0.0 KJ/mol
Hof(H2O(l)) = -285.8 KJ/mol
Hof(CO2(g)) = -393.5 KJ/mol
Balanced chemical equation is:
CH3CH2CH2CHO(l) + 5/2 O2(g) ---> 4 H2O(l) + 4 CO2(g)
ΔHo rxn = 4*Hof(H2O(l)) + 4*Hof(CO2(g)) - 1*Hof( CH3CH2CH2CHO(l)) - 5/2*Hof(O2(g))
-2471.8 = 4*(-285.8) + 4*(-393.5) - 1*Hof(CH3CH2CH2CHO(l)) - 5/2*(0.0)
Hof(CH3CH2CH2CHO(l)) = -245.4 KJ/mol
Answer: a
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19. What is the standard enthalpy of formation of liquid butyraldehyde, CH:CH2CH2CHOCO CHỊCH CHỊCHOI) + O2(g) – 4H2O) + 4CO(g); AH = -2471.8 kJ Substance AH/(kJ/mol) CO2(g) -393.5 H2O(1) -285.8 a. -245.4 kJ/mol b. +245.4 kJ/mol c. -1792.5 kJ/mol d. -3151.1 kJ/mol e. +3151.1 kJ/mol
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