Question

What is the total charge on all of the electrons in two liters, 2 kg, of water? One mole of water has a mass of 18 g and each molecule of water contains 10 electrons.

Way I worked problem:
(2kg)(1000g/1kg)(1mol/18g)(10e-/1mol)(-1.60e-19/1e-)

What I did do wrong?

Answer 1

You need to know that there are 6.022 *10^23 molecules in 1 mole
so
there are (10 e- /1MOLECULE) (6*10^23 molecules/mol)
in other words your answer needs to be multiplied by Avagadro's number

Answer 2

I believe you have omitted the number of molecules in a mole; i.w., 6.02 x 10^23 molecules H2O/mol. Check my thinking.

Answer 3

-1.07e8 C