Answer to Question #125347 in Chemistry for Nona

Question

Calculate the number of atoms in 3 moles of water of hydrogen and oxygen seperately and total number of atoms

Answer 1

Solution:

Water (H₂O) is made up of one oxygen atom and 2 hydrogen atoms.

So,

1 mol H₂O = 2 mol H atoms = 1 mol O atoms

Moles of O atoms = Moles of H₂O = 3 mol

Moles of H atoms = 2 × Moles of H₂O = 2 × 3 mol = 6 mol

One mole of any substance contains 6.02×10²³ units of that substance.

Thus:

The number of oxygen atoms = (3 mol) × (6.02×10²³) = 18.06×10²³ O atoms

The number of oxygen atoms = (6 mol) × (6.02×10²³) = 36.12×10²³ H atoms

The total number of atoms = No. of O atoms + No. of H atoms = (18.06 + 36.12)×10²³ = 54.18×10²³

Answer:

No. of O atoms is 18.06×10²³

No. of H atoms is 36.12×10²³

The total number of atoms is 5.42×10²⁴