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Q.1 In which of the following changes at constant pressure is work done by system on surrounding? By the surrounding on system?
Initial state Final state

(i) H2O (g) ¾® H2O (l)
(ii) H2O (s) ¾® H2O (g)
(iii) H2O (l) ¾® H2O (s)
(iv) 2H2(g) + N2(g)¾® 2NH3 (g)

(v) CaCO3 (s) ¾® CaO (s) + CO2 (g)
Q.2 The gas is cooled and loses 65 J of heat. The gas contracts as it cools and work done on the system
equal to 20 J is exchanged with the surroundings. What are q, w and DE ?

Q.3 The enthalpy change for the reaction of 50 ml of ethylene with 50.0 ml of H2 at 1.5 atm pressure is DH = – 0.31 KJ. What is the DE.

Q.4 The enthalpy of combustion of glucose is – 2808 KJmol–1 at 25°C. How many grams of glucose do you need to consume [Assume wt = 62.5 Kg].
(a) to climb a flight of stairs rising through 3M.
(b) to climb a mountain of altitude 3000 M?
Assume that 25% of enthalpy can be converted to useful work.

JEE Thermodynamics questions