When an ideal gas is compressed adiabatically and reversibly, the final temperature is:
1. higher than the initial temperature
2. lower than the initial temperature
3. the same as the initial temperature
4. dependent on the rate of compression
1 liter-atmosphere is equal to:
1. 101.3 J
2. 24.20 cal
3. 101.3 x 107 erg
4. All of the above
An ideal gas expands at a constant external pressure of 2.0 atmosphere by 20 litre and absorbs 10kJ of heat from surrounding. What is the change in internal energy of the system:-
(1) 4052 J
(2) 5948 J
(3) 14052 J
(4) 9940 J
36 ml of pure water takes 100 sec to evaporate from a vessel and heater connected to an electric source which delivers 806 watt. The of H2O is:-
(1) 40.3 kJ/mol
(2) 43.2 kJ/mol
(3) 4.03 kJ/mol
(4) None of these
A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy U of the gas in joules will be
(1) 1136.25 J
(2) - 500 J
(3) - 505 J
(4) + 515 J