When 1.8 g of steam at the normal boiling point of water is converted into water, at the same temperature, enthalpy and entropy changes respectively will be
[ Given ∆Hvap for water = 40.8kJ mol-1 ]
-8.12 kJ, 11.89JK -1
10.25kJ, 12.95JK -1
-4.08 kJ, -10.93 JK -1
10.93 kJ, 4.08 JK -1
Which of the following processes is reversible?
Transfer of heat by radiation
Electrical heating of a nichrome wire
Transfer of heat by conductor
Geothermal compression
One mole of a gas occupying 3 dm3 expands against constant external pressure of 1 atm to a volume of 13 dm3. The work done is
-10 atm dm3
-20 atm dm3
40 atm dm3
-50 atm dm3
The enthalpy of vaporization of liquid diethyl ether (C2H5)2O, is 26.0 kJ mol -1 at its boiling point (35oC). What will be the ∆S for conversion of liquid to vapour and vapour to liquid respectively?
+84.41 and -84.41 JK -1 mol -1
+80.90 and –68.83 JK -1 mol -1
-84.41 and +90.63 JK -1 mol -1
+68.83 and -84.41 JK -1 mol -1
(∆H - ∆E) for the formation of carbon monoxide (CO) from its elements at 298 K is (R = 8.314 JK -1 mol -1)
-2477.57 J mol -1
2477.57 J mol -1
-1238.78 J mol -1
1238.78 J mol -1
Spontaneous adsorption of a gas on solid surface is an exothermic process because
∆H increases for system
∆S increases for gas
∆S decreases for gas
∆G increases for gas.
Latent heat of vaporization of a liquid at 500 K and 1 atm pressure is 10.0 kcal/mol. What will be the change in to internal energy (∆E) of 3 mole of liquid at same temperature ?
30 kcal
-54 kcal
27.0 kcal
50 kcal
A monoatomic ideal gas undergoes a process in which the ratio of p to V at any instant is constant and equals to 1. What is the molar heat capacity of the gas?
4R / 2
3R / 2
5R / 2s
Zero
An ideal gas expands in volume from 10-3 m3 to 10-2 m3 at 300 K against a constant pressure of 105 Nm-2.
The work done is
800 kJ
900 kJ
270 kJ
-900 J
