Question

Calculate the mass of 1 atom of magnesium

Answer 1

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.

Answer 2

Molar mass of Mg is 24

It indicates mass of 1 mole Mg is 24g

now, if it is 1 mole

then it must have 6.022×10^23 atoms

Therefore,

mass of 6.022×10^23 atoms is 24 g

mass of 1 atom = 24/6.022×10^23

$= 3.985\times {10}^{ - 23} g$