How much positive and negative charges is there in a cup of water?

Explanation

Let us assume that the mass of one cup of water is 250 g. The molecular mass of water is 18g Thus, one mole (`= 6.02 xx 10 ^(23)` molecules) of water is 18g. Therefore the number of molecules in one cup of water is ` ((250)/( 18) ) xx 6.02 xx10 ^(23) `
Each molecules of water contains two hydrogen atoms and one oxygen atom. i.e. 10 electrons and 10 protons.Hence the total positive and total negative charges has the same megnitude .It is equal to ` ((250)/( 18) ) xx 6.02 xx10 ^(23) xx 10 xx 1.6 xx 10 ^(-19) C =1.34 xx 10 ^(7)C `