How much hydrogen and oxygen atom is in a 133g of water?

Answer 1

H₂O is water

Molar mass = 18.0 g (3 significant figures)

Find the moles of water in 133 g....

133 g x 1 mol/18.0 g = 7.389 moles H2O

Find number of hydrogen atoms...

7.389 moles H₂O x 6.02x10²³ molecules/mole x 2 H atoms/molecule = 8.90x10²⁴ hydrogen atoms

Find number of oxygen atoms...

7.389 moles H₂O x 6.02x10²³ molecules/mole x 1 O atom/molecule = 4.45x10²⁴ oxygen atoms