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Electrochemistry
Question
If the current of 0.5 ampere flows through a metallic wire for 2 hours, then how many electrons flow through the wire?
Solution
Answer:
Current, I = 0.5 A
Current, I = 0.5 A
Time, t = 2 hours
Convert in sec we get
Time, t = 2 × 60 × 60 s
= 7200 s
Use formula
Charge Q = It
Plug the values we get
= 0.5 A × 7200 s
= 3600 Coulombs
Number of electrons = total charge / charge on 1 electrons
= 3600/(1.6 ×10 19)
=2.25 × 1022 electrons
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