On the Pauling scale of electronegativity, carbon has an electronegativity value of 2.55, and hydrogen has a value of 2.20. To calculate the electronegativity difference between carbon and hydrogen in a methane CH4 molecule, subtract the electronegativity value of hydrogen from that of carbon:Electronegativity difference = Electronegativity of carbon - Electronegativity of hydrogenElectronegativity difference = 2.55 - 2.20Electronegativity difference = 0.35The electronegativity difference between carbon and hydrogen in a methane molecule is 0.35 on the Pauling scale.