Question

A dilute solution of sulphuric acid is electrolysed using a current of 0.10 A for 2 hours to produce hydrogen and oxygen gas. The total volume of gases produced at STP is ____ cm3. (Nearest integer)

[Given : Faraday constant F = 96500 C mol–1 at STP, molar volume of an ideal gas is 22.7 L mol–1]

Answer 1

The correct answer is: 127 cm3

2 F produces = $\frac{3}{2}$ mole of gas

0.10 ×2 × 3600 coulomb produces

$=\frac{\frac{3}{2}×0.1×2×3600}{2×96500}$

= 0.0056 moles of gas

= 0.0056 × 22.7 L

≃ 0.127 L

= 127 mL