The electronegativity difference between a carbon atom and an oxygen atom can be calculated by subtracting the electronegativity value of carbon from that of oxygen.Electronegativity difference = Electronegativity of Oxygen - Electronegativity of CarbonElectronegativity difference = 3.44 - 2.55Electronegativity difference = 0.89The electronegativity difference between a carbon atom and an oxygen atom is 0.89.