Question

please answer it its urgent

Answer 1

It's molecular mass is 20gm

Answer 2

6 x 10²³ atoms of any element indicates 1mole of the element.

6 x 10²⁴ atoms of the element indicates 10 moles of it.

10moles weigh 200 grams 
so, 1mole weighs 20 grams.

Thus the atomic weight of the element is 20 grams.

Let the element be X.

It is given that the element forms a homodiatomic molecule consisting of 2 atoms ....that is X₂



So the molecular mass of molecule X₂ = 40 grams
             The atomic mass of element X = 20 grams