Question

12g  M₂O₃ contains 8g of metal. Atomic mass of metal is :

(a) 12

(b) 24

(c) 36

(d) 48

Answer 1

Correct option is 4. 48

Given: 12gM₂O₃ contains 8g of metal.

To find: We have find the atomic mass of the metal.

Solution:

Atomic mass of oxygen = 16

Here three oxygen atoms are present so, total atomic mass = 16 x 3 = 48

12gM₂O₃ contains 8g of metal.

The amount of oxygen is = (12 - 8) = 4g

Now, 4g of oxygen has total atomic mass 48g

8g of metal has total atomic mass = \(\frac{8\times 48}4\) = 96

Atomic mass of the metal can be given as-

= \(\frac{96}{2}\) 

= 48

Atomic mass of metal is 48.