Question

How many gram of chlorine are contain in 1 mole of chlorine?

How many molecules are there in 1 gram of chlorine?

Answer 1

1) Atomic wt. of chlorine is 35g.(atomic wt. of an element is equal to wt. of 1 mole of atom of that element)

So 35 gram of Chlorine contain 1 mole chlorine atom.

2) 1 mole = 6.023 x 10²³ atoms

35gram = 6.023 x 10²³ atoms

∴1 gram of chlorine will contain = 6.023 x 10²³ atoms / 35gram = 0.172 x 10²³ atoms = 1.72 x 10²² atoms/gram