What is meant by an electron volt (eV) ?Express this energy in   kJ mol−

An electron volt is the energy required to move an electronic charge (e) through a potential of exactly one volt (V).(i) 1eV=1.6×10−19C×1.0V=1.6×10−19J                                                                            [∵CV=J](ii) 1.6×10−19J×1kJ103J×6.023×1023mol=96.4kJmol−                                                                ∵1kJ=103J(iii)  1.6×10−19J×1kcal4184J×6.023×1023mol∣=23 k cal mol−                                                                    [∵1kcal=4184J]