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Calculate the energy obtainable from a lead storage battery in which 0.1 mol lead is consumed. Assume a constant concentration of 10.0 M
(A)
Now, (0.100 mol Pb)
Energy = qE = (19300 C) (2.22 V) = 42.8 kJ.
Adiponitrile is manufactured electrolytically from acrylonitrile
How many kg of adiponitrile (molecular mass = 108) is produced in 9.65 hr using a current of 3750 A with 80% efficiency ?
(B)
A certain metal salt solutions is electrolysed in series with a silver coulometer. The weights of silver and the metal deposited are 0.5094 g and 0.2653 g. Calculate the valency of the metal if its atomic weight is nearly that of silver.
(B) Evidently
The reduction potential of a half-cell consisting of a Pt electrode immersed in and solution at .
(A)
In a concentration cell, as the cell discharges,
(B). In the above representation of the cell, the reaction proceeds to the left; 1.0 M solution is used up.
In a half-cell containing the cell potential is – 1.2496 V for the reaction The standard reduction potential of the couple at is
(D) For the oxidation reaction,
The standard reduction potentials for and couples in acid medium at are 1.50 V and 1.00 V respectively. The following reaction:
(C)
Eº for the above reaction=1.50 V + (– 1.0)V = 0.50 V
Since Eº is positive,Gº is negative and the reaction is spontaneous.
If a 100 mL solution of 0.1M HBr is titrated using a very concentrated solution of NaOH, then the conductivity (specific conductance) of the solution at the equivalence point will be (assume volume change is negligible due to addition of NaOH). Calculate your answer in terms of
(B) At the equivalence point the concentrations will be
Therefore,
The volume of gases liberated at STP when a charge of 2F is passed through aqueous solution of sodium phosphate, is :
(C) At anode
At cathode
After passage of 2F, one mole of and 1/2 mole of would be produced. The total volume is 33.6L.
It is desired to convert the energy derived from the combustion of propane into electrical energy, via a fuel cell. Given that the standard free energies of formation of are -23.5, -237.2 and -394.4 respectively, calculate the standard EMF of the propane fuel cell.
(A) For the combustion of propane
the overall for the reaction
20 electrons are involved in the cell reactions
Na-amalgam is prepared by electrolysis of NaCl solution using liquid Hg as cathode. How long should the current of 10 amp. is passed to produce 10% Na – Hg on a cathode of 10 gm Hg. (atomic mass of Na = 23).
(A) 90 gm Hg has 10 gm Na
The standard reduction potential of a silver chloride electrode is 0.2 V and that of a silver electrode is 0.79 V. The maximum amount of AgCl that can dissolve in solution is
(B)
Now solubility of AgCl in 0.1 M AgNO3
Hence 1 mole dissolves in L solution hence in L amount that dissolves in 1 mmol.
The for a 0.00099 M solution. Calculate the reciprocal of the degree of dissociation of acetic acid, if for acetic acid is 400 S
(B)
1/.125 = 8
A hydrogen electrode X was placed in a buffer solution of sodium acetate and acetic acid in the ratio a : b and another hydrogen electrode Y was placed in a buffer solution of sodium acetate and acetic acid in the ratio b : a. If reduction potential values for two cells are found to be respectively w.r.t standard hydrogen electrode, the value of the acid can be given as
(B)
At what does the following cell have its reaction at equilibrium ?
(B) anode : Ag(s)
cathode: