Two moles of an ideal monoatomic gas (CV=20.9JK-1mol-1)are heated from 300K to 350K.The volume of the gas changes from 0.02m3 to 0.2m3.Assuming that the heat capacity remains constant in this temperature change for the system, calculate; i. Entropy change for the system. ii. Entropy change for the surroundings. iii. Entropy change for the universe. April 11, 2016 Read More »
One mole of a diatomic gas at 300k and 5 atm expands to 1 atm. Assuming ideal behavior, calculate w, q, ?E and ?H if the expansion carried out was adiabatic and reversible. Given CV=20.9JK-1mol-1 Cp=29.9JK-1mol-1 (20 marks April 11, 2016 Read More »
Explain with an example each of the following : a) An adiabatic process .(2 marks) b) An isochoric process.(2 marks) c) Isothermal process.(2 marks) d) Systems and surroundings.( 2 marks) e) Closed system and isolated system.( 2 marks) April 11, 2016 Read More »
A steel bottle contains 20 liters of hydrogen at 270c and a pressure of 50 atm. The gas expands isothermally and reversibly to 100 liters. Calculate: 1) How much heat had to be supplied? (4 marks) 2)The pressure of the hydrogen after expansion. (4 marks) 3)How much work was performed by the gas during expansion .(4 marks) April 11, 2016 Read More »
Show that the moment of inertia of a solid disc of mass M and radius R about an axis through its centre and perpendicular to its plane is given by, (3 marks) I=(MR^2)/2 (ii) A circular disc of radius 0.1m and mass 1 kg is rotating at a rate of 10 revolutions per second about its axis. Find the work that must be done to increase the rate of its revolution to 20 revolutions per second. April 11, 2016 Read More »
Define the following terms; (i)Angular velocity . (ii)Torque. (iii)Radius of gyration. April 11, 2016 Read More »
Verify divergence theorem for the function; V=(x2-z2)i+ 2xy j + (y2 + z)k for a unit cube situated at the origin, bounded by the six planes x=y=z=0, x=y=z=1 (5 marks) April 11, 2016 Read More »