How many H atoms in 12H2O?

24 atoms of H or 1.4 x 10²⁵ hydrogen atoms

Explanation:

simple method

1 H₂O has atoms of hydrogen and 1 atom of oxygen

while 12H₂O will have 24 atoms of hydrogen and 12 atom of oxygen

by Avagadros number

molar mass of water H₂0=18.01528 g/mol

1 mole of H₂0 have 2 moles of Hydrogen

one mole of water = 6.02⋅10²³water molecules = 1.2 x 10²⁴hydrogen atoms

12 mole of H₂O = 1.2 x 10²⁴ x 12 = 1.4 x 10²⁵ hydrogen atoms

1.4 x 10²⁵ hydrogen atoms in 12 moles of H₂O