A quantity of electrical charge that brings about the deposition of 4.5 Al from A l 3+ at the cathode will also produce the following volume at (STP) of H 2(g) from H + at the cathode

Question

A quantity of electrical charge that brings about the deposition of 4.5 Al from A l 3+ at the cathode will also produce the following volume at (STP) of H 2(g) from H + at the cathode (A) 44.8 L (B) 22.4 L (C) 11.2 L (D) 5.6 L

Tardigrade Admin · Accepted Answer

2 H ++2 e- longrightarrow H 2 A 3++3 e - longrightarrow Al (w(H2)/w(A l))=(E(H2)/E(A l))=(1/9) w( H 2)=4.5 × (1/9)=0.5 g =(1/4) mol H 2 =(22.4/4)=5.6 LH 2 at STP

Q. A quantity of electrical charge that brings about the deposition of $4.5 A l$ from $A l^{3 +}$ at the cathode will also produce the following volume at (STP) of $H_{2} (g)$ from $H^{+}$ at the cathode

44.8 L

22.4 L

11.2 L

5.6 L

$2 H^{+} + 2 e^{-} ⟶ H_{2}$
$A^{3 +} + 3 e^{-} ⟶ A l$
$\frac{w ( H _{2} )}{w ( A l )} = \frac{E ( H _{2} )}{E ( A l )} = \frac{1}{9}$
$w (H_{2}) = 4.5 \times \frac{1}{9} = 0.5 g = \frac{1}{4} m o l H_{2}$
$= \frac{22.4}{4} = 5.6 L H_{2}$ at STP

Q. A quantity of electrical charge that brings about the deposition of 4.5Al from Al3+ at the cathode will also produce the following volume at (STP) of H2​(g) from H+ at the cathode