1 mole=6.023x10²³ atoms

1.8 moles=6.023x1.8x10²³= 1.08x10²⁴ atoms

 

in 1 H atom,no.of electrons=1

in 1.08x10^23 atoms= 1.08x10^23 electrons

 

charge on 1 electron= -1.6x10^ -19c

 

thus,total charge of all the electrons= -1.6x10^ -19 x 1.08x10^24

                                                    = -1.728x10^5

                                                    = -1.73x10^5