Chemistry, asked by panchalrasiklal, 10 months ago


How much electricity in terms of Paradays
is reduired to produce ?
( 20.0 g of ca from molten calle
(2)81g of AL from molten Al2o3

Answers

Answered by ipatelsiddh
1

Answer:

(i)

The balance reaction will

The charge on Ca in CaCl2

Ca + 2Cl = 0

Cl has –1 charge so that

Ca + 2(–1) = 0

Ca = 2

We have to get 2o g Ca from Ca2+

Number of required moles = mass / molar mass

Molar mass of Ca is 40 g/mol and required mass of Ca is 20 g

Hence number of moles = 20/40 = 0.5 mol

Electricity required to produce 1 mol of calcium = 2 F

The electricity required to produce 0.5 mol of calcium

= 0.5 × 2 F

= 1 F

(ii)

Charge on Al in Al2O3

2Al + 3O = 0

Oxygen has –2

2Al +3(–2) = 0

Al = 3

Change transfer n = 3

Charge required for 1 mol of Al = 3F

Number of moles of Al = 40 /27 = 1.48

The electricity required to produce 1.48 mol of Al = 1.48 × 3 F

= 4.44 F

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