How many GRAMS of hydrogen are present in 3.17 moles of water ? grams.

Answer 1

Atomic mass of hydrogen (H) = 1.01 g / mole

3.17 moles H₂O contains 3.17 moles of O and 2 x 3.17 moles of H = 6.34 moles of H

grams of H = 6.34 moles H x 1.01 g H / mol = 6.40 g of H (3 significant figures)