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One mole is 6.022 x 10²³ atoms.

We have 0.25 moles.

0.25 x 6.022 x 10²³ = 1.5055 x 10²³

0.25 moles of magnesium contains 1.5055 x 10²³ atoms.

Hope this helps!

Mole is used to measure the amount of smaller particles such as ions, atoms, and molecules. There are atoms are present in the 0.25 moles of magnesium.

Mole:

Mole is used to measure the amount of smaller particles such as ions, atoms, and molecules.  One mole is equal to the Avogadro's constant.

  •    One mole of atoms is present in the 12 g of C-12.
  •    1 mole = [tex]\bold { 6.022 x 10^2^3}[/tex]

Given here,

Number of moles of Magnesium = 0.25 mole

The number of atoms present in the

[tex]\bold { = 0.25 \times 6.022 x 10^2^3} \\\\\bold {= 1.5055 x 10^2^3}[/tex]

Therefore, there are atoms are present in the 0.25 moles of magnesium.

To know more about moles, refer to the link:

brainly.com/question/20290065