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Which of the following is the charge present in $0.1 mole$ of ${Cu}^{2 +}$ ions if the electric charge on one electron is $1.602 \times 10^{- 19} C$ ?

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0.2 F

0.4 F

0.8 F

10 F

answer is A.

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Detailed Solution

0.1 mole

{Cu}^{2 +}

ions

0.2 F

charge is present.
One

{Cu}^{2 +}

ion consists of

2

positive charges.
One

mole  of {Cu}^{2 +} ion carries = 2 Farad charges .

0.1 mole {Cu}^{2 +} ion includes = 0.2 F charge .

There are

6.02 \times 10^{23}

electrons per

mole

.
So we get the charge on one mole of electrons as-

1.6 \times 10^{- 16} \times 6.02 \times 10^{23} = 96500 C

which is also known as 1 Farad.

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