Question

The weight of silver $\text{(atomic wt.}=108)$ displaced by a quantity of electricity which diaplces $5600mLof{O}_2$ at STP will be : -

• A. $10.8g$
• B. $5.4g$
• C. $108.0g$
• D. $54.0g$

Answer 1

The correct option is C $108.0g$

According to Faraday's $2^{nd}$ law

$\frac{w_{Ag}}{E_{Ag}}=\frac{w_{O_2}}{E_{O_2}}$
Weight of $O_2=n_{O_2}\times M_{O_2}$
Weight of $O_2=\frac{5600}{22400}\times 32$
Voljume of $O_2$ at STP=22400mL
$\frac{w_{Ag}}{108}=\frac{\left(\frac{5600}{22400}\right)\times 32}{8}$

$\therefore w_{Ag}=108g$