Question

4.6*10²² atoms of an element weighs 13.8g.Atomic mass of element is?(need the answer with a detailed explanation)

Answer 1

Atomic weight of an element = Mass (g) of that element in 1 mole

We know that,

1 mole of an element = 6.023 x 10²³ atoms .

If 4.6 x 10²² atoms of an element weigh 13.8 g

∴ 6.023 x 10²³ atoms of that element will weigh (6.023 x 10²³ x 13.8 g) / (4.6 x 10²²) = 180.69 g.

Therefore,

1 mole of an element weighs 180.69 g, so

Atomic Weight of the element = 180.69 g