Question

The cost of electricity producing 1 kg of Mg from molten MgCl2 by electrolysis is Rs 9. The cost of electricity to produce 10 kg of Al by electrolysis of A12O3 dissolved in molten cryolite would be

Answer 1

Explanation:

12th

Chemistry

Electrochemistry

Electrochemical Cells

The cost of electricity req...

CHEMISTRY

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Asked on December 27, 2019 by

Hitesh Mohit

The cost of electricity required to deposit 1 gm of Mg is Rs. 5.. How much would it cost to deposit 10 gm. of Al?(Atwt.Al=27,Mg=24)

MEDIUM

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ANSWER

For Magnesium

m=1 gm

M=24 gm

No.ofMoles=

Molarmass

Mass

No.ofMoles=

24

1

=0.04 moles

No. of atoms in 1 mole =6.022×10

23

No. of atoms in 0.04 mole =0.04×6.022×10

23

=2.4×10

22

atoms

For Aluminium

m=10 g

M=27 g

No.ofmoles=

27

10

=0.37 moles

No. of atoms in 0.37 moles=0.37×6.022×10

23

=2.2×10

23

atoms

According to question

cost to deposit 2.4×10

22

atoms is =Rs 5

Cost to deposit 2.3×10

23

atoms is =

2.4×10

22

5

×2.2×10

23

=44 Rs