Calculating Total Electric Charge in a 50kg Sample of Water

[dtrain121]

Homework Statement

Find the total electric charge of all the electrons in a 50kg sample of water

Homework Equations

a conversion factor

The Attempt at a Solution

I need the atomic # and the atomic mass but it is water. If I had those two i could solve the problem. How do i get those two things?

 

[Delphi51]

Water is H2O - two oxygen and two hydrogen atoms. You can look up their masses and charges on a periodic table or look up the elements in Wikipedia.

 

[RoyalCat]

The atomic number of an element also tells you have many electrons it has.
The atomic number of Hydrogen is 1, and that of oxygen is 8.

The molar mass of water is 18 grams/mol.

There are N_A molecules in one mol of substance.

N_A=6.02*10^{23} mol^{-1}