In 90 gram of water

What will be the total number of electrons in this total number of particles?

Number of gram molecules = 5 (calculated in part a)

Now, 1 molecule of water contains:

1 × 8 electron of oxygen

2x1 electron of Hydrogen

Total 10 electrons per molecule.

So total number of electrons = Number of gram molecules × number of electron per molecule

Total number of electrons = 5 × 10

Total number of electrons = 50 moles of electrons

As we know 1 mole = 6.022 × 10²³

∴ 50 moles of electrons = 50 × 6.022 × 10²³

= 3.01 × 10²⁵ number of electrons

Thus, the total number of electrons = 3.01 × 10²⁵