Calculate the number of moles in 4.22x1022 molecules of H, O

0.07 moles of water

Explanation:

Given data:

Number of molecules of water = 4.22×10²²

Number of moles of water = ?

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules of water

4.22×10²²  molecules × 1 mol /6.022 × 10²³ molecules  

0.7 ×10⁻¹ mol

0.07 moles of water

108

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