Question

A current liberates 0.50 g of hydrogen in 2 hours. The weight of copper (at. wt. = 63.5) deposited at the same time by the same current through copper sulphate solution is ______.

Options

• 63.5 g

• 31.8 g

• 15.9 g

• 15.5 g

Answer 1

A current liberates 0.50 g of hydrogen in 2 hours. The weight of copper (at. wt. = 63.5) deposited at the same time by the same current through copper sulphate solution is 15.9 g.

Explanation:

Given: Mass of H₂ liberated = 0.50 g

Equivalent weight of H = `1/1` = 1

Equivalent weight of Cu = `63.5/2` = 31.75

Using the ratio formula:

`(m_H)/(E_H) = (m_(Cu))/(E_(Cu))`

⇒ `0.50/1 = (m_(Cu))/31.75`

⇒ m_Cu​ = 0.50 × 31.75

= 15.875

= 15.9 g