Electrochemistry Question 4
Question 4 - 2024 (27 Jan Shift 1)
The mass of silver (Molar mass of $\mathrm{Ag}: 108 \mathrm{gmol}^{-1}$ ) displaced by a quantity of electricity which displaces $5600 \mathrm{~mL}$ of $\mathrm{O}_{2}$ at S.T.P. will be ________ g.
Show Answer
Answer (108)
Solution
Eq. of $\mathrm{Ag}=$ Eq. of $\mathrm{O}_{2}$
Let $x$ gm silver displaced, $\frac{\mathrm{x} \times 1}{108}=\frac{5.6}{22.7} \times 4$
(Molar volume of gas at STP $=22.7$ lit) $\mathrm{x}=106.57 \mathrm{~gm}$
Ans. 107
OR, as per old STP data, molar volume $=22.4 \mathrm{~lit}$
$\frac{\mathrm{x} \times 1}{108}=\frac{5.6}{22.4} \times 4, \mathrm{x}=108 \mathrm{gm}$.
Ans. 108
