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Calculate the volume in cm³ of oxygen evolved at ...

Calculate the volume in cm³ of oxygen evolved at s.t.p when a current of 5A is passed through acidified water for 193s?
[F = 96500 C mol¹. Molar volume of a gas at s.t.p = 22.4dm³]

A.

0.056dm³

B.

0.224dm³

C.

224.000dm³

D.

56.000dm³

View answer & explanation

Correct answer is A

Q = 193 x 5 = 965C
40H $\mapsto$ 2H₂O + O₂ + 4e
4 x 96500C = 22.4dm³
965C = x

x = $\frac{22.4 \times 965}{4 \times 96500}$
= 0.056dm³

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