Work done in the reversible adiabatic process is given by:
1. 2.303 RT log (V2/V1)
2.
3. 2.303 RT log(V1/V2)
4. none of these
The work done by a mass less piston in causing an expansion V (at constant temperature), when the opposing pressure, P is variable, is given by:
1. W=
2. W=0
3. W= -PV
4. none of these
The maximum work done in expanding 16 g oxygen at 300 K and occupying a volume of 5 dm3 isothermally until the volume becomes 25 dm3 is:
1. 2.01 x 103 J
2. +2.81 x 103 J
3. 2.01 x 10-3 J
4. +2.01 x 10-6 J
During an adiabatic process:
1. pressure is maintained constant
2. gas is isothermally expanded
3. there is perfect heat insulation
4. the system changes heat with surroundings
The internal energy change when a system goes from state A to B is 40 kJ/mol. If the system goes from A to B by a reversible path and returns to state A by an irreversible path. What would be the change in internal energy?
1. 40 kJ
2. >40 kJ
3. <40 kJ
4. Zero
The mathematical form of the first law of thermodynamics when heat (q) is supplied and W is work done by the system (-ve) is:
1. U=q+W
2. U=q-W
3. U=-q+W
4. U= -q-W
5 moles of an ideal gas expands isothermally and irreversibly from a pressure of 10 atm to 1 atm against a constant external pressure of 1 atm. find the Wirr at 300 K:-
1. -15.921 kJ
2. -11.224 kJ
3. -110.83 kJ
4. None of these
Consider the reactionat 300K
H2(9) + Cl2(9) →2HCI(g), ΔH° = — 185 KJ
If 3 mole of H2 completely react with 3 mol of Cl2 to form Cl, U° of the reaction will be
(1) Zero
(2) –185 KJ
(3) -555 KJ
(4) None
An ideal gas is taken from the same initial pressure P1 to the same final pressure P2 by three different processes. If it is known that point 1 corresponds to a reversible adiabatic and point 2 corresponds to a single stage adiabatic then
(1) Point 3 may be a two stage adiabatic.
(2) the average K.E. of the gas is maximum at point 1
(3) Work done by surrounding in reaching point number '3' will be maximum
(4) If point4 and point 5 lie along a reversible isotherm then T5 < T1.
For the isothermal expansion of an ideal gas
(1) E and H increases
(2) E increases but H decreases
(3) H increases but E decreases
(4) E and H are unaltered