Question

0.4 g of a metal oxide contains 0.16 g of oxygen. The equivalent mass of the metal will be:

• A. 24 g
• B. 12 g
• C. 40 g
• D. 16 g

Answer 1

The correct option is B 12 g

Mass of the metal oxide = 0.4 g
Mass of oxygen = 0.16 g
$\therefore$Mass of the metal = 0.4 - 0.16
= 0.24 g
We know that,
$\frac{\text{mass of the metal}}{\text{mass of oxygen}}=\frac{\text{equivalent mass of the metal}}{\text{equivalent mass of oxygen}}$

$\frac{0.24}{0.16}=\frac{\text{equivalent mass of the metal}}{8}$

Hence, the equivalent mass of the metal is 12 g