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

HARD

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Pressure over $1000 ml$ of a liquid is gradually increased from $1 bar$ to $1001 bar$ , under adiabatic conditions. The final volume of the liquid is $990 ml$ . Assuming linear variation of volume with pressure, which of the following is/are correct for this process?

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Important Questions on Chemical Thermodynamics

HARD

Chemistry>Physical Chemistry>Chemical Thermodynamics>Enthalpy and Enthalpy Change

Calculate the work done in the following reaction at $50 ° C$ . State whether work is done on the system or by the system.

${SO}_{2 (g)} + \frac{1}{2} O_{2 (g)} \to {SO}_{3 (g)}$

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Enthalpy and Enthalpy Change

Consider the following reaction:

CaO (s) + {CO}_{2} (g) ⟶ {CaCO}_{3} (s)

. The reaction is spontaneous at low temperature because

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Enthalpy and Enthalpy Change

Calculate the work done during the reactions represented by the following thermochemical equation at

300 K

\underset{(g)}{{CH}_{4}} + \underset{(g)}{2 O_{2}} \to \underset{(g)}{{CO}_{2}} + \underset{(l)}{2 H_{2} O}

(R = 8.314 {JK}^{- 1} {mol}^{- 1})

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Enthalpy and Enthalpy Change

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>Enthalpy and Enthalpy Change

A better criterion for ideality of a gas than

{(\frac{\partial U}{\partial V})}_{T} = 0

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Enthalpy and Enthalpy Change

Which of the following relation is not correct?

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Enthalpy and Enthalpy Change

The standard enthalpy of vaporisation

Δ_{vap} H °

, for water at

100 ° C

40.66 kJ {mol}^{- 1}

. The internal energy of vaporisation of water at

100 ° C

(in

{kJmol}^{- 1}

) is (assume water vapour to behave like an ideal gas)

HARD

Chemistry>Physical Chemistry>Chemical Thermodynamics>Enthalpy and Enthalpy Change

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)

HARD

Chemistry>Physical Chemistry>Chemical Thermodynamics>Enthalpy and Enthalpy Change

What will be the enthalpy of reaction

2 NO + O_{2} \to 2 {NO}_{2}

from the given formation enthalpy values ? The standard enthalpy of formation values for

O_{2},

NO

and

{NO}_{2}

are as follows:

O_{2} (g) : 0 kJ / mol, NO (g) : 90.25 kJ / mol

and

{NO}_{2} (g)

33.18 kJ / mol

respectively.

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Enthalpy and Enthalpy Change

Find the approximate value of

(ΔH - ΔU)

J \cdot {mol}^{- 1}

, for the formation of

CO

from its elements at

298 K

(R = 8.314 J \cdot K^{- 1} {mol}^{- 1})

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Enthalpy and Enthalpy Change

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

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Enthalpy and Enthalpy Change

Two moles on an ideal gas is expanded isothermally and reversibly at 300 K form 1 L to 10 L. The enthalpy change in KJ is

HARD

Chemistry>Physical Chemistry>Chemical Thermodynamics>Enthalpy and Enthalpy Change

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:

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Enthalpy and Enthalpy Change

$A$ fish swimming in water body when taken out from the water body is covered with a film of water of weight $36 g$ . When it is subjected to cooking at $100 ° C$ , then the internal energy for vaporization in ${kJmol}^{- 1}$ is integer]

[Assume steam to be an ideal gas. Given $Δ_{vap} H^{⊖}$ for water at $373 K$ and $1$ bar is $41.1 kJ {mol}^{- 1} : R = 8.31 J K^{- 1} {mol}^{- 1}$ ]

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Enthalpy and Enthalpy Change

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

$(A)$ Question Image

$(B)$

$(C)$

$(D)$

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Enthalpy and Enthalpy Change

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)

HARD

Chemistry>Physical Chemistry>Chemical Thermodynamics>Enthalpy and Enthalpy Change

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:

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Enthalpy and Enthalpy Change

For the formation of

{NH}_{3} (g)

from its constituent elements at constant temperature and presssure, which of the following options is correct

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Enthalpy and Enthalpy Change

2

moles of a monoatomic ideal gas at

25^{o} C

is heated reversibly at a constant pressure of

2 atm

to reach a final temperature of

125^{o} C

. Calculate the

Δ H . (C_{v} = \frac{3}{2} R)

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Enthalpy and Enthalpy Change

Identify the equation in which change in enthalpy is equal to change in internal energy

Pressure over 1000 ml of a liquid is gradually increased from 1 bar to 1001 bar, under adiabatic conditions. The final volume of the liquid is 990 ml. Assuming linear variation of volume with pressure, which of the following is/are correct for this process?

Important Questions on Chemical Thermodynamics

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Pressure over $1000 ml$ of a liquid is gradually increased from $1 bar$ to $1001 bar$ , under adiabatic conditions. The final volume of the liquid is $990 ml$ . Assuming linear variation of volume with pressure, which of the following is/are correct for this process?