Question

an element X is found to combine with oxygen to form X 4O6 if 8.4 gram of this element combines with 6.4 gram of oxygen then calculate atomic weight of X

Answer 1

Answer:

The answer is 31.5 g/mol.

Explanation:

As it is given that  

6 x 16g of Oxygen combines with 4 x atomic mass of X

It is given that  6.4 g of Oxygen combines with 8.4 g of X element.

We can say that  

8.4 / 6.4 x 6 x16 = 4 x Atomic weight of X

1.3125 x 96         =  4 x Atomic weight of X

                 126    = 4 x Atomic weight of X

Atomic weight of X = 126 /4  

                             = 31.5 g/mol