Question

3. An atom of magnesium weighs 3.98 x 10-23 g. Calculate the number of atoms in 12 g of magnesium.
[3.015 ~ 10231
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Answer 1

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Answer:

We know that, 1 mole of Magnesium weighs 12 g

⇒ 1 mole = 24 g

⇒ 1 mole = 6.023 × 10²³ atoms = 24 g

According to question we are required to find how much 1 atom weighs.

⇒ 6.023 × 10²³ atoms → 24 g :: 1 atom → x

Product of means = Product of Extremes

⇒ x = 24 g / 6.023 × 10²³

⇒ x = 3.98 × 10⁻²³ g

Hence the mass of one atom of Mg is 3.98 × 10⁻²³ g.