Thermodynamics · Question 9

The work done during reversible isothermal expansion of one mole of hydrogen gas at 25 from pressure of 20 atmosphere to 10 atmosphere is (Given R = 2.0 cal K-1 mol-1)

1. 0 calorie
2. -413.14 calories
3. 413.14 calories
4. 100 calories

Choose the correct statement for the work done in the expansion and heat absorbed or released when 5 litres of an ideal gas at 10 atmospheric pressure isothermally expands into vacuum until volume is 15 litres :

1. Both the heat and work done will be greater than zero
2. Heat absorbed will be less than zero and work done will be positive
3. Work done will be zero and heat will also be zero
4. Work done will be greater than zero and heat will remain zero

For an endothermic reaction: Choose the correct answer from the options given below:

1. B and D
2. C and D
3. A and B
4. A and C

For the following reaction at 300 K A2(g) + 3B2(g) 2AB3(g) the enthalpy change is +15 kJ, then the internal energy change is :

1. 19988.4 J
2. 200 J
3. 1999 J
4. 1.9988 kJ

Which amongst the following options is the correct relation between change in enthalpy and change in internal energy?

1. H = U + ng RT
2. H - U = - n RT
3. H + U = n R
4. H = U - ng RT

Which of the following p-V curve represents maximum work done?

1. [figure]
2. [figure]
3. [figure]
4. [figure]

One mole of an ideal gas at 300 K is expanded isothermally from 1 L to 10 L volume. U for this process is : (Use R = 8.314 J K-1 mol-1)

1. 0 J
2. 1260 J
3. 2520 J
4. 5040 J

Which one among the following is the correct option for right relationship between CP and CV for one mole of ideal gas?

1. CV = RCP
2. CP + CV = R
3. CP - CV = R
4. CP = RCV

For irreversible expansion of an ideal gas under isothermal condition, the correct option is :

1. U 0, Stotal = 0
2. U = 0, Stotal = 0
3. U 0, Stotal 0
4. U = 0, Stotal 0

For the reaction, 2Cl(g) Cl2(g), the correct option is :

1. r H > 0 and r S < 0
2. r H < 0 and r S > 0
3. r H < 0 and r S < 0
4. r H > 0 and r S > 0