Question

A certain current liberates $0.504g$ hydrogen is $2$ hours. How many gram of oxygen can be liberated by the same current in the same time?

• A. 2.0 g
• B. 0.4 g
• C. 4.0 g
• D. 8.0 g

Answer 1

Answer: (C)

Since, same amount of current is passed for same time,
$\frac{w_H}{w_O}=\frac{E_H}{E_O}$
(Here, $w$ represents mass and $E$ represents equivalent mass.)
$\frac{0.504}{w_O}=\frac{E_H}{E_O}$
(Here, $w$ represents mass and $E$ represents equivalent mass.)
$\frac{0.504}{w_O}=\frac{1.008}{8}$
$w_O=\frac{0.504\times 8}{1.008}=4.0g$