Question on: JAMB Chemistry - 2016
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
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Correct Option: 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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