How many moles are in 1.9x1020 atoms of gold (II) chloride (AuCl2)?

0.32×10⁻³ mol

Explanation:

Given data:

Number of atom of gold(II) chloride = 1.9×10²⁰ atoms

Number of moles = ?

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 atoms

1.9×10²⁰ atoms × 1 mol /  6.022 × 10²³ atoms

0.32×10⁻³ mol

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