The difference between C ¯ p and C ¯ V is C ¯ p and C ¯ V signify molar quantities]

larger in case of gases in comparison to solids and liquids

larger in case of liquids in comparison to gases and solids

larger in case of solids in comparison to gases liquids

equal in solids, liquids and gases

A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 3 7 . 0 ∘ C . As it does so, it absorbs 208 J of heat. The values of q and w for the process will be (R = 8.314 J/mol K) (ln7.5 = 2.01)

q = + 2 0 8 J , w ⁡ = - 2 0 8 J

q = + 2 0 8 J , w ⁡ = + 2 0 8 J

q = - 2 0 8 J , w ⁡ = - 2 0 8 J

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The value of $C_{P}$ and $C_{V}$ for a gas are $4$ R and $3$ R. The vapour density of gas is $30$ . Its atomic mass will be

50% studentsanswered this correctly

Important Questions on Chemical thermodynamics and energetics

EASY

Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

A piece of ice falls from a height

h

so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of

h

is:
(Latent heat of ice is

3.4 \times 10^{5} {J kg}^{- 1}

and

g = 10 {N kg}^{- 1}

)

MEDIUM

Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

A piece of metal weighing

100 g

is heated to

80 ° C

and dropped into

1 kg

of cold water in an insulated container at

15 ° C

. If the final temperature of the water in the container is

15.69 ° C

, the specific heat of the metal in

J / g ° C

. is

MEDIUM

Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

When a

60 W

electric heater is immersed in a gas for

100 s

in a constant volume container with adiabatic walls, the temperature of the gas rises by

5 ° C

. The heat capacity of the given gas is

{JK}^{- 1}

(Nearest integer)

MEDIUM

Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

The combination of plots which does not represent isothermal expansion of an ideal gas is

$(A)$ Question Image

$(B)$

$(C)$

$(D)$

EASY

Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

The quantity of heat (in $J$ ) required to raise the temperature of $1.0 k g$ of ethanol from $293.45 K$ to the boiling point and then change the liquid to vapor at that temperature is closest to [Given, boiling point of ethanol $351.45 K$ . Specific heat capacity of liquid ethanol $2.44 J g^{- 1} K^{- 1}$ . Latent heat of vaporisation of ethanol $855 J g^{- 1}$ ]

HARD

Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

An ideal gas undergoes isothermal compression from

5 m^{3}

1 m^{3}

against a constant external pressure of

4 N m^{- 2}

. The heat released in this process is

24 J {mol}^{- 1} K^{- 1}

and is used to increase the pressure of

1

mole of

Al

. The temperature of

Al

increases by:

HARD

Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

The molar heat capacity for an ideal gas at constant pressure is $20.785 J K^{- 1} {mol}^{- 1}$ . The change in internal energy is $5000 J$ upon heating it from $300 K$ to $500 K$ . The number of moles of the gas at constant volume is____

(Given: $R = 8.314 J K^{- 1} {mol}^{- 1}$ )

MEDIUM

Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

A system consisting of 1 mol of an ideal gas undergoes a reversible process,

A \to B \to C \to A

(schematically indicated in the figure below). If the temperature at the starting point A is 300 K and the work done in the process

B \to C

is 1 L atm, the heat exchanged in the entire process in L atm is

Question Image

EASY

Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

The difference between

{\bar{C}}_{p}

and

{\bar{C}}_{V}

[{\bar{C}}_{p}

and

{\bar{C}}_{V}

signify molar quantities]

HARD

Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

The specific heat of a certain substance is $0.86 J g^{- 1} K^{- 1}$ . Assuming ideal solution behavior, the energy required (in $J$ ) to heat $10 g$ of $1$ molal of its aqueous solution from $300 K$ to $310 K$ is closest to :

[Given: molar mass of the substance $= 58 g {mol}^{- 1}$ ; specific heat of water $= 4.2 J g^{- 1} K^{- 1}$ ]

HARD

Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

A reversible cyclic process for an ideal gas is shown below. Here,

P, V, a n d T

are pressure, volume and temperature, respectively. The thermodynamic parameters

q, w, H a n d U

are heat, work, enthalpy and internal energy, respectively.

Question Image

The correct option(s) is (are)

MEDIUM

Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

At constant volume,

4 m o l

of an ideal gas when heated from

300 K

500 K

changes its internal energy by

5000 J .

The molar heat capacity at constant volume is ________

HARD

Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

The above

P - V

diagram represents the thermodynamic cycle of an engine, operating with an ideal mono-atomic gas. The amount of heat, extracted from the source in a single cycle, is:

MEDIUM

Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

The qualitative sketches I, II and III given below show the variation of surface tension with molar concentration of three different aqueous solutions of KCl,

C H_{3} O H

and

C H_{3} {(C H_{2})}_{11} O S O_{3}^{-} N a^{+}

at room temperature. The correct assignment of the sketches is -

Question Image

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Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of

37 . 0^{\circ} C

. As it does so, it absorbs 208 J of heat. The values of q and w for the process will be
(R = 8.314 J/mol K) (ln7.5 = 2.01)

EASY

Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

Calculate the work done during compression of

2

mol of an ideal gas from a volume of

1 m^{3}

10

{dm}^{3}

300 K

against a pressure of

100 kPa

EASY

Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

The work done during combustion of

9 \times 10^{- 2}

kg

of ethane,

C_{2} H_{6} (g)

300 K

is (Given

R = 8 .314 {JK}^{- 1} {mol}^{- 1}

, atomic mass

C = 12, H = 1

)

MEDIUM

Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

$200 mL$ of $0.2 M HCl$ is mixed with $300 mL$ of $0.1 M NaOH .$ The molar heat of neutralization of this reaction is $- 57.1 kJ .$ The increase in temperature in ${}^{\circ}C$ of the system on mixing is $x \times 10^{- 2} .$ The value of $x$ is (Nearest integer)

[Given: Specific heat of water $= 4.18 J g^{- 1} K^{- 1}$

Density of water $= 1.00 g {cm}^{- 3}$ ]

(Assume no volume change on mixing)

MEDIUM

Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

Two moles of helium gas is mixed with three moles of hydrogen molecules (taken to be rigid). What is the molar specific heat of mixture at constant volume?

(R = 8.3 J / m o l K)

MEDIUM

Chemistry>Physical Chemistry>Chemical thermodynamics and energetics>Heat Capacity and Latent Heat

X g

of ice at

0^{o} C

is added to 340g of water at

20^{o} C

. The final temperature of the resultant mixture is

5^{o} C

. The value of

X

(in g) is closest to

[Heat of fusion of ice

= 333 J / g

; Specific heat of water

= 4.184 J / g . K

]

The value of CP and CV for a gas are 4R and 3R. The vapour density of gas is 30. Its atomic mass will be

Important Questions on Chemical thermodynamics and energetics

Learn and Prepare for any exam you want !

The value of $C_{P}$ and $C_{V}$ for a gas are $4$ R and $3$ R. The vapour density of gas is $30$ . Its atomic mass will be