When one mole of monoatomic ideal gas at TK undergoes reversible adiabatic change under a constant external pressure of 1 atm changes volume from 1 litre to 2 litre. The final temperature in kelvin would be:
1. T/(2)2/3
2. T + 2/(3x0.0821)
3. T
4. T - 3/(2x0.0821)
When two moles of an ideal gas (Cp, m=R) heated from 300 K to 600 K at constant pressure the change in entropy of gas () is:-
(1) Rln2
(2) -Rln2
(3) 7R ln 2
(4) 5 Rln2
In an adiabatic expansion of an ideal gas-
1. W = –ΔE
2. W = ΔE
3. ΔE = 0
4. W = 0
Equal volumes of monoatomic and diatomic gases at same initial temperature and pressure are mixed. The ratio of specific heats of the mixture (Cp/Cv) will be [AFMC 2002]
(1) 1
(2) 2
(3) 1.67
(4) 1.5
Two mole of an ideal gas is expanded isothermally and reversibly from 1 litre ot 10 litre at 300 K. The enthalpy change (in kJ) for the process is [IIT JEE (Screening) 2004]
1. 11.4 kJ
2. –11.4 kJ
3. 0 kJ
4. 4.8 kJ
In an isobaric process, the ratio of heat supplied to the system (dQ) and work done by the system (dW) for diatomic gas is [AFMC 2002]
(1) 1 : 1
(2) 7 : 2
(3) 7 : 5
(4) 5 : 7
One mole of hydrogen gas at and 1 atm pressure is heated at constant pressure until its volume has doubled. Given that for hydrogen is 3.0 cal deg-1 mol-1, the and for this process are-
1. = 1490 cal and = 894 cal
2. = = 1490 cal
3. = 894 cal and = 1490 cal
4. = = 894 cal
One mole of a real gas is subjected to heating at constant volume from state to state. Then it is subjected to irreversible adiabatic compression against constant external pressure of P3 atm till syatem reaches the final state. If the constant volume molar heat capacity of real gas is CV. Find out correct expression for from state 1 to state 3-
1.
2.
3.
4.
1 mole of NH3 gas at is expanded adaibatic condition to make volume 8 times (=1.33). Final temperature and work done respectively are-
1. 150 K, 900 cal
2. 150 K, 400 cal
3. 250 K, 1000 cal
4. 200 K, 800 cal
. This R is :
1. Change in K.E.
2. Change in rotational energy
3. work done which system can do on expanding the gas per mol per degree increase in temperature
4. All correct