V=(N / N_a)*V_m=(7.4*10¹⁵/6.02*10²³)*22.4=2.7535*10^{-7 л}

Hope you understand english a bit. In the first step, you calculate the number of moles of the substance given by dividing the number of particles into the Avogadro const. Then you multiply the computed figure to the molar volume which is equal to 22.4 l/mole.