simple!!!! charge flown in 230 s = 1.7X230 C and with 90% efficiency = 1.7X230X0.9 C therefore moles of electrons released = 1.7X230X0.9 / 96500 moles = 3.64 millimoles now,
Zn2+ + 2e -----> Zn
this means Zn2+ converted into Zn = 1/2 of 3.64 = 1.82 millimoles
initially Zn2+ were 0.16 X 300 = 48 millimoles
hence Zn2+ left = 46.18 millimoles
so, concentration = 46.18/300 = 0.153933 M :)
LOKESH SARDANA,
department of Production and Industrial engineering,
Indian Institute of Technology,Roorkee.
Happiness can be found, even in the darkest of times, if one only remembers to turn on the light.
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Harry Potter and the Prisoner of Azkaban movie
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Moderation Team
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