How many atoms of hydrogen are found in 12.6 moles of water?

1 mole of water contains 6.023*10^23 molecules of water!

so in each molecule, there are two hydrogen atoms, so,

6.023*10^23*2 = 12.046*10^23

so in one mole there are 12.04*10^23 atoms of hydrogen

therefore in 12.6 moles, 12.04*12.6*10^23 = 151.9*10^23

in standard form, 1.52 * 10^25 atoms of hydrogen! ... answer!

12.6 moles x 2 atoms of H per molecule x (6.02 * 10^23) = 1.517 x 10^25 atoms