We now know that a hydrogen atom has a mass of 1.6735 x 10-24 grams, and that the oxygen atom has a mass of 2.6561 X 10-23 grams..

Because the molecular mass of Hydrogen is 1 gram/mole, there is 1 mole of hydrogen in 1 gram of hydrogen atoms. For every mole, there are 6.02*1023 atoms, so in 1 gram of hydrogen there are 6.02*1023 hydrogen atoms (in scientific notation) this is equal to 602000000000000000000000 hydrogen atoms.

A gram molecule is the number of molecules present in one mole of that substance, instead of the atoms. The weight of 1 atom of hydrogen is calculated as 1.66058 × 10-24 grams.

2.01588 grams
The mass of one mole of H2 is 2.01588 grams but some sources also list it as 2.016 grams. A molecule of H2 is formed when two hydrogen atoms bond…

Skill 3-1 Calculate the molecular mass of a compound as the sum of the atomic masses of its elements. So, one mole of water (6.022 x 10 23 molecules) has a mass of 18.02 g.

H2 – There are 2 moles of hydrogen atoms (1 mole of elemental hydrogen).

The definition of Avogadro’s number of 6.022 × 1023/mole is the number of atoms or molecules per one gram atomic weight. For one gram atomic weight of hydrogen with atomic weight of one gram, one mole of hydrogen contains 6.022 × 1023 hydrogen atoms.

Mass of 1 mole of hydrogen atoms = Mass of 1 hydrogen atom×NA , where NA=L=6.0225×1023⋅mol−1 .

23 hydrogen atoms
The definition of Avogadro’s number of 6.022 × 1023/mole is the number of atoms or molecules per one gram atomic weight. For one gram atomic weight of hydrogen with atomic weight of one gram, one mole of hydrogen contains 6.022 × 1023 hydrogen atoms.

2 moles
A mole of water molecules contains 2 moles of hydrogen atoms and 1 mole of oxygen atoms.

1.00784 u
Hydrogen/Atomic mass

Molar mass of a substance is the mass of one mole of the substance in grams. It has a unit of grams per mole (g mol -1 ). One mole of any substance contains 6.02 × 10 23 particles . Therefore, the molar mass of a substance contains 6.02 × 10 23 particles of the substance.

The atomic number of the element Hydrogen is 1

Properties: Common hydrogen has a molecular weight of 2,01594 g. As a gas it has a density of 0.071 g/l at 0ºC and 1 atm. Its relative density, compared with that of the air, is 0.0695. Hydrogen is the most flammable of all the known substances. Hydrogen is slightly more soluble in organic solvents than in water.

The molar mass of a single hydrogen atom is 1 g/mol. The molar mass of a hydrogen molecule is 2 x 1 g/mol = 2 g/mol.