Question

The total number of electrons resent in 18 ml of water is .

Answer 1

18 mL water X 1 g/mL = 18 g water 

moles H2O = 18 g / 18 g/mol = 1 mole H2O 

Number of H2O molecules = 1 mol X 6.02X10^23 molecules/mole= 6.02X10^23 molecules 

Total electrons in 1 H2O molecule = 10 electrons/molecule 

So, 6.02 X 10^23 molecules X 10 electrons/molecule = 6.02 X 10^24 electrons