Question

the atomic weight of two elements A and B are 40 u and 80 u respectively. If xg of A contains y atoms.how many atom are present in 2xgofB​

Answer 1

In case of same number of atoms,

(Mass of A) : (Mass of B) = 20 : 40 = 1 : 2

Now, (Mass of A) : (Mass of B) = x : 2x = 1 : 2

Then, they have the same number of atoms, i.e.

There are Y atoms of B.