Mol wt of water = 18 g/mol

So, 18 g = 1 mole

Then, 100 g = (1/18) x 100 moles = 5.55 moles.

1 mole of water has 2 electrons (H₂O → 2H⁺ + O^2-)

Then, 5.55 moles of water will have = 2 x 5.55 = 11.1 electrons.