Question

Carbon monoxide and methanol can react together to form ethanoic acid.
CO(g) + CH3OH(l) CH3CO2H(l)
Standard enthalpy changes of combustion are given in the table.
compound standard enthalpy change
of combustion,
CO –283.0kJ mol–1
CH3OH –726.0kJ mol–1
CH3CO2H –874.1kJ mol–1
What is the value for for the reaction between carbon monoxide and methanol?
A –1883.1kJmol^–1
B –134.9kJ mol^–1
C +134.9kJ mol^–1
D +1883.1kJmol^–1

Answer 1

Answer:

Option number b

Explanation:

The standard enthalpy of formation of liquid methanol, CH3OH(l) = ΔHf1° + 2(ΔHf2°) - ΔH3° = (-393.5 kJ/mol ) + 2(-285.8 kJ/mol ) - (- 726.56 kJ/mol) = -238.54 kJ/mol.