Step 1: Find the mole ratio for each of the choices, and then multiply mole ratio by the 1 mole of H20 and Avogadro's number (6.022 x 10^23), so you will have this for each choice
1 mole H2O ( ratio /ratio) (6.022 x 10^23 / 1 mole) = atoms
One: 1 mole of water (H2O
You have 2 mole of H to 1 mole H2O, so the ratio is 2 to 1 or 2:1, and you have
1 mol H2O x (2 mol H / 1 mol H2O) x (6.022x10^23 atoms H / mol H) = 1.2 x 10^24
So, we can stop right here, because we have the value you were looking for. If you want, you can work the other 3 in the same manner.
1 mol CH4 x (4 mol H / 1 mol CH4) x (6.022x10^23 atoms H / mol H) =
2 mol NH3 x (2 mol H / 1 mol NH3) x (6.022x10^23 atoms H / mol H) =
2 mol H2 x (2 mol H / 1 mol H2) x (6.022x10^23 atoms H / mol H) =
I tried as hard as i could then i noticed i answered this on my test and i got it right so i just typed it all in
