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Nitrogen molecules made 7.0 x 109 collisions in one second at 298K and 1 atm. Determine the molecular diameter for nitrogen molecules.
Drive the relationship between the temperature and volume for a reversible adiabatic process
Calculate the pressure differential of ethanol across the surface of a spherical droplet of radius 220 nm at 20°C. The surface tension of ethanol at that temperature is 22.39 mN m -1 .
The Debye – Huckel limiting law gives the mean activity coefficient, log γ± = -A z+z- (I)1/2
Where A is a constant, and I is the ionic strength ( mol/dm3). Obtain an expression for d log γ± / d I
The volume V of a liquid is given by
V = Vo (a + bT + CT2)
Where Vo is the volume of liquid at 298 K, a = 0.85, b = 4.2 x10-4 /K and c = 1.67 x 10-6 /K2. Determine dV/dT for the liquid at 350 K in terms of Vo.
If In K for a reaction, where K is the equilibrium constant, is plotted against the absolute temperature T, then
d(InK)/dt = - ΔH o /RT2
where ΔHo = -1119.7 kJ/mol. What is the gradient of the graph of In k against T at 25oC?
a) Calculate the amount of chlorine gas evolved during the electrolysis of molten potassium chloride on passing a current of 0.5 A for two hours through it.
b) Define a potentiometric titration and draw a schematic graph of a redox potentiometric titration.
b) The cell reaction for a galvanic cell is given below:
Zn(s) + 2Ag+ (aq) →Zn2+ (aq) + 2Ag(s)
i) Write the half-cell reactions at the anode and the cathode.
ii) Calculate the value of cell emf under standard conditions; use data from Table 7.1.
iii) Will the reaction be spontaneous as written?
Differentiate between voltaic and electrolytic cells.
In the determination of transference numbers of HCl by moving boundary method a 0.10 M solution of HCl was taken in a cell having uniform area of cross section of 1.6 cm2. At the end of experiment the boundary moved by 11.7 cm and 0.22 g of silver was deposited on the cathode of silver coulometer. Calculate the transference numbers of ions of HCl.
