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The molar specific heat of oxygen at constant pressure $C_{P} = 7.03 cal {mol}^{- 1} ° C^{- 1}$ and $R = 8.31 J {mol}^{- 1} ° C^{- 1}$ . The amount of heat taken by $5 mol$ of oxygen when heated at constant volume from $10 ° C$ to $20 ° C$ will be approximately

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Important Questions on Thermodynamics

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IMPORTANT

PHYSICS FOR JOINT ENTRANCE EXAMINATION WAVES AND THERMODYNAMICS>Chapter 4 - Thermodynamics>Exercises>Q 39

In an adiabatic process,

R = \frac{2}{3} C_{V}

. The pressure of the gas will be proportional to:

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PHYSICS FOR JOINT ENTRANCE EXAMINATION WAVES AND THERMODYNAMICS>Chapter 4 - Thermodynamics>Exercises>Q 40

In an isobaric process,

Δ Q = \frac{K γ}{γ - 1}

where

γ = C_{p} / C_{V}

. What is

K ?

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PHYSICS FOR JOINT ENTRANCE EXAMINATION WAVES AND THERMODYNAMICS>Chapter 4 - Thermodynamics>Exercises>Q 41

Four moles of hydrogen, two moles of helium and one mole of water vapour form an ideal gas mixture. What is. the molar specific heat at constant pressure of mixture ?

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PHYSICS FOR JOINT ENTRANCE EXAMINATION WAVES AND THERMODYNAMICS>Chapter 4 - Thermodynamics>Exercises>Q 42

Two cylinders fitted with pistons contain equal amount of an ideal diatomic gas at

300 K

. The piston of $A$ is free to move, while that of

B

is held fixed. The same amount of heat is given to the gas in each cylinder. If the rise in temperature of the gas in

A

30 K

, then the rise in temperature of gas in

B

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PHYSICS FOR JOINT ENTRANCE EXAMINATION WAVES AND THERMODYNAMICS>Chapter 4 - Thermodynamics>Exercises>Q 43

A gas under constant pressure of

4.5 \times 10^{5} Pa

when subjected to

800 kJ

of heat changes the volume from

0.5 m^{3}

2.0 m^{3}

. The change in the internal energy of the gas is

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PHYSICS FOR JOINT ENTRANCE EXAMINATION WAVES AND THERMODYNAMICS>Chapter 4 - Thermodynamics>Exercises>Q 44

Five moles of hydrogen

(γ = \frac{7}{5})

, initially at STP

(P = P_{a t m}, T = 0 ° C)

, is compressed adiabatically so that its temperature becomes

400 ° C

. The increase in the internal energy of the gas (in

kJ

) is____

(R = 8.30 J {mol}^{- 1} K^{- 1})

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PHYSICS FOR JOINT ENTRANCE EXAMINATION WAVES AND THERMODYNAMICS>Chapter 4 - Thermodynamics>Exercises>Q 45

Three samples of the same gas

A, B

and

C (γ = \frac{3}{2})

have initially equal volume. Now the volume of each sample is doubled. The process is adiabatic for

A

isobaric for

B

and isothermal for

C

. If the final pressures are equal for all three samples, the ratio of their initial pressures are

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PHYSICS FOR JOINT ENTRANCE EXAMINATION WAVES AND THERMODYNAMICS>Chapter 4 - Thermodynamics>Exercises>Q 46

One mole of an ideal gas at temperature

T_{1}

expands according to the law

\frac{P}{V} =

constant. Find the work done when the final temperature becomes

T_{2}

The molar specific heat of oxygen at constant pressure CP=7.03 cal mol-1 °C-1 and R=8.31 J mol-1 °C-1. The amount of heat taken by 5 mol of oxygen when heated at constant volume from 10 °C to 20 °C will be approximately

Important Questions on Thermodynamics

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The molar specific heat of oxygen at constant pressure $C_{P} = 7.03 cal {mol}^{- 1} ° C^{- 1}$ and $R = 8.31 J {mol}^{- 1} ° C^{- 1}$ . The amount of heat taken by $5 mol$ of oxygen when heated at constant volume from $10 ° C$ to $20 ° C$ will be approximately