Thermodynamics ...

Q. A gas is cooled and loses 65 J of heat. The gas contracts as it cools and work done on the system equal to 22 J is exchanged with the surroundings. Thus, q, W and ΔE (change in internal energy) are (in joules)

Which of the following is true for a steady flow system?

One kg of carbon produces __________ kg of carbon dioxide.

A gas absorbs 200 J of heat and expands by 500 cm³ against a constant pressure of 2 x 10⁵ Nm^-2. Change in internal energy is 

The pressure-volume work for an ideal gas can be calculated using the expression

This type of work can also be calculated using the area under the curve within the specified limits. When an ideal gas is compressed, (I) reversibly or (II) irreversibly, then

In the following case

Assuming that water vapour is an ideal gas, internal energy change (ΔE)when 1 mole of water is vaporised at 1 bar pressure and 100°C will be

(Given, molar enthalpy of vaporisation of water at 1 bar and 373 K = 41 kJ mol^-1)

[IIT JEE 2007]

1.0 mole of a monoatomic ideal gas is expanded from state I to state II at 300 K.

Thus, work done is

A " 1/4 HP" electric motor uses 187 W of electrical energy while delivering 35 J of work each second. How much energy must be dissipated in the form of friction (heat)?

1 mole of a diatomic gas is contained in a piston. It gains 50.0 J of heat and work is done on the surrounding by the system is -100 J. Thus,

The internal energy of compressed real gas, as  compared to that of the ideal gas at the same temperature is

A piston filled with 0.04 mole of an ideal gas expands reversibly from 50.0 mL to 375.0 mL at constant temperature of 37.0°C. As it does, it absorbs 208 J of heat. The value of q and W for the process will be (R = 8.314 J mol^-1 K^-1, In 7.5 =2.01)

[JEE Main 2013]

A sample containing 1.0 mole of an ideal gas is expanded isothermally and reversibly to ten time of its original volume, in two separate experiments. The expansion is carried out 300 K and at 600 K, respectively. Choose the correct option.

The internal energy of a perfect gas is :

In a certain chemical process, a lab technician supplies 254 J of heat to a system. At the same time, 73 J of work area done on the system by its surroundings. What is the increase in the internal energy (in J) of the system ?

Direction (Q. Nos. 16-17) This section contains a paragraph, wach describing theory, experiments, data etc. three Questions related to paragraph have been given.Each question have only one correct answer among the four given options (a),(b),(c),(d).

A fixed mass m of a gas is subjected to transformation of states from K to L to M to N and back to K as shown in the figure.

Q. The succeeding operations that enable this transformation of states are 

[JEE Advanced 2013] 

A fixed mass m of a gas is subjected to transformation of states from K to L to M to N and back to K as shown in the figure.

Q. A pair of isochoric processes among the transform ation of states is 

Direction (Q. Nos. 18) Choice the correct combination of elements and column I and coloumn II  are given as option (a), (b), (c) and (d), out of which ONE option is correct.

I. A sample of an ideal gas underwent an expansion against a constant external pressure of 1.0 bar from 1.0 m³, 10.0 bar, and 273 to 10.0 m³, 1.0 bar and 273 K. Work done by the system on the surroundings is W₁ (in J).

II. The external pressure was increased to 10.0 bar and the gas sample was isothermally compressed from 10.0 m³ and 1.0 bar to 10 m³ and 10.0 bar.
Work done on the system by the surroundings is W₂ (in J).

III. Total work done is W₃ (in J).

IV. Least amount of work needed to restore the system to the original p-V conditions is W₄ (in J) .

Match W₁ W₂, W₃ and W₄ in Column I with corresponding values in Column II.

Energy hidden in a definite quantity of substance is:

One mole of an ideal gas, C_p = 4 R at 300 K Is expanded adiabatically to n times the original volume. What is value of n if temperature falls by 150°?