Enthalpy
Trending Questions
Q. Consider the following liquid – vapour equilibrium.
Liquid⇌Vapour
Which of the following relations is correct?
Liquid⇌Vapour
Which of the following relations is correct?
- d In PdT2=−ΔHvT2
- d In PdT=−ΔHvRT
- d In GdT2=ΔHvRT2
- d In PdT=ΔHvRT2
Q. One mole of an ideal gas at 300 K in thermal contact with surroundings expands isothermally from 1.0L to 2.0L against a constant pressure of 3.0 atm. In this process, the change in entropy of surroundings (ΔS) in T−1 is (1 L atm = 101.3J)
- -5.763
- 5.763
- 1.013
- -1.013
Q. Internal energy change for combustion of ethanol is 416.5 kJ mol−1. The calorific value of ethanol at 300 K in (kJ) is (Take R= 25/3 J/molK)
Q. The enthalpy change involved in the oxidation of glucose is 2880 kJ/mol. 25% of this energy is available for muscular work. If 100 kJ of muscular work is required to walk 1 km, calculate the maximum distance that can be covered by a person who as consumed 120 g of glucose
- 7.9 km
- 9.7 km
- 4.8 km
- 8.4 km
Q. Which of the following is always negative for exothermic reaction?
- None of these
- ΔH
- ΔS
- ΔG
Q. For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, pick the correct option:
- ΔU<0, w=0
- ΔU=0, w<0
- ΔU>0, w=0
- ΔU<0, w>0
Q.
Consider an endothermic reaction X→Y with the activation energies Eb and Ef for the backward and forward reactions, respectively. IN general
There is no definite relation between Eb and Ef
Eb < Ef
Eb = Ef
Eb > Ef
Q. Point out the wrong statement in relation to enthalpy
- It is a state function
- It is an intensive property
- Its value depends upon the amount of substance in the system
- It is independent of the path followed for the change
Q. One mole of an ideal gas undergoes a change in state from (2 atm, 3L, 95K) to (4 atm, 5L, 245K). Calculate the change in enthalpy if ΔU=30L−atm:
- Cannot be predicted as pressure is not constant
- 40L - atm
- 42.3L - atm
- 44L - atm
Q. For the isothermal expansion of an ideal gas
- E increases but H decreases
- H increases but E decreases
- E and H are unaltered
- E and H increases