Question

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

Answer 1

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 !

Answer 2

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