Question

During the electrolysis of water $4mol$ of electrons were transferred from anode to cathode, The total volume of gases produced at $STP$ will be approximately

• A. $67.2L$
• B. $22.4L$
• C. $44.8L$
• D. $89.4L$

Answer 1

The correct option is A $67.2L$

The reaction of electrolysis of water is given by,

$2H_{2}O\to 2H_2+O_2$

At anode, $2H_{2}O\to O_2+H^{+}+4e^{-}$

At Cathode, $2H^{+}+2e^{-}\to H_2$

From the reaction it is clear that 4 moles of electrons wil give 1mol of $O_2$ and 2mol of $H_2$

Molar Volume at STP is $22.4L$

Therefore, Total molar volume$=3\times 22.4L=67.2L$