Physical Chemistry Answers

Explain the principle of steam distillation. When
a liquid which is immiscible with water was
steam distilled at 95.6°C under a total pressure
of 7.5 x 104Pa, the distillate contained 1.20 g of
the liquid per gram of water. Calculate the
molar mass of the liquid. Vapour pressure of
water is 6.5 x 104Pa at 95-6°C.

(2) In an experiment (enthalpy) the following
data were collected:

Initial mass of water in the calorimeter: 70.89 g

Initial temperature of the water in the calorimeter: 17.6 °C

Final mass of water in the calorimeter: 86.48 g

Final temperature in the calorimeter: 0.0 °C

(a) Find the mass of ice that melted.
(b) Calculate the number of mol of ice melted.
(c) What was the change in temperature of the initial mass of water
in the calorimeter?
(d) Calculate the energy released by the initial mass of water. (The
specific heat capacity of water is 4.184 J g–1 °C–1.)
(e) What was the energy absorbed by the ice that melted?
(f) Calculate the energy required to melt 1 mol of ice.

A metal sphere weighing 19.48g is added to 20ml of water in a graduated cylinder. If the density of the metal is 4.50g/ml, what will be the new level of water in the graduated cylinder?

Forces of cohesion between gas molecule is ____ than the forces of cohesion between liquid molecules
a. Less. b. Equal to c. Greater. d. Similar

A metal sphere weighing 19.48g is added to 20ml of water in a graduated cylinder. If the density of the metal is 4.50g/ml, what will be the new level of water in the graduated cylinder?

The degree of ionisation of a 0.1M bromoacetic acid solution is 0.123. Calculate the pH of the solution and the of bromoacetic acid.

What is a well behaved wave function? Illustrate with example

Rate of formation of So3 according to the reaction 2So2 + O2 gives 2So3 is 1.6×10^-3 kg/min hence rate at which So2 reacts as.

By using the Le Chatelier’s principle, discuss the following factors which may affect the
position of equilibrium. In your explanations, mention any possible change in the value of
K, and whether the amounts of reactants or products increases or decreases depending
whether the equilibrium shits either left or right.
i. An increase of the pressure of a gaseous reaction system.
ii. A decrease in the amount of product.
iii. An increase in the amount of reactants.
iv. The volume of the reaction vessel is decreased.

The co efficient of thermal expansion of water is 2×10 to the power - 4 per °C. 200 gm of water at 25 °C is heated to 50 °C under 2 atm. External pressure.given density of water at 25° C is 0.9970 gm /c.c and Cp =75.30JK-1 mole - 1. Calculate W, del H, Q