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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One mole of monoatomic ideal gas expands adiabatically at initial temperature $T$ against a constant external pressure of 1 atm from 1 L to 2 L. Find out the final temperature $(R = 0.0821 L atm K^{-1} {mol}^{-1}).$

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Important Questions on Chemical Thermodynamics

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Thermodynamic Processes

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>Thermodynamic Processes

Which of the following options is an intensive property of a system?

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Thermodynamic Processes

When

5

moles of

He

gas expand isothermally and reversibly at

300 K

from

10

litres to

20

litres, the magnitude of the maximum work obtained in

J

is . [nearest integer ] (Given :

R = 8.3 J K^{- 1} {mol}^{- 1}

and

\log 2 = 0.3010

)

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Thermodynamic Processes

A gas undergoes change from state

A

to state

B

. In this process, the heat absorbed and work done by the gas is

5 J and 8 J

, respectively. Now gas is brought back to

A

by another process during which

3 J

of heat is evolved. In this reverse process of

B to A

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Thermodynamic Processes

Identify the correct set of intensive properties from the following

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Thermodynamic Processes

The first law of thermodynamics for isothermal process is

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Thermodynamic Processes

Which of the following is not an intensive property?

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Thermodynamic Processes

Which of the following can be considered as the definition/principle of energy?

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Thermodynamic Processes

During a reversible adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio

\frac{C_{p}}{C_{V}}

for the gas is

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Thermodynamic Processes

For an adiabatic change in a system, the condition which is applicable will be

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Thermodynamic Processes

The molar enthalpy change for

H_{2} O (l) ⇌ H_{2} O (g)

373 K

and

1 atm

40 kJ / mol

. Assuming ideal behaviour, the internal energy change for vaporization of

1 mol

of water at

373 K

and

1 atm

kJ {mol}^{- 1}

is:

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Thermodynamic Processes

In a closed insulated container, a liquid is stirred with a paddle to increase its temperature. In this process, which of the following is true?

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Thermodynamic Processes

Following figure shows two processes

A

and

B

for a gas. If

∆ Q_{A}

and

∆ Q_{B}

are the amount of heat absorbed by the system in two cases, and

∆ U_{A}

and

∆ U_{B}

are changes in internal energies, respectively, then:
Question Image

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Thermodynamic Processes

Δ U

is equal to:

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Thermodynamic Processes

During compression of a spring the work done is

10 k J

and

2 k J

escaped to the surroundings as heat. The change in internal energy,

Δ U (i n k J)

is:

MEDIUM

Chemistry>Physical Chemistry>Chemical Thermodynamics>Thermodynamic Processes

365

calorie heat is required to evaporate one gram water at

100 {}^{\circ}C

. If the work done by the system is

651.3

calorie, then the increase in internal energy per mole of water will be

HARD

Chemistry>Physical Chemistry>Chemical Thermodynamics>Thermodynamic Processes

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 $= 4.2 J g^{- 1} K^{- 1}$ ]

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Thermodynamic Processes

Thermodynamic properties are divided into two broad types: intensive properties and extensive properties. Which of the following is NOT an intensive property?

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Thermodynamic Processes

Which of the following is NOT an intensive property?

EASY

Chemistry>Physical Chemistry>Chemical Thermodynamics>Thermodynamic Processes

Among the following, the set of parameters that represents path functions, is:
i)

q + w

ii)

q

iii)

w

iv)

H - T S

One mole of monoatomic ideal gas expands adiabatically at initial temperature T against a constant external pressure of 1 atm from 1 L to 2 L. Find out the final temperature (R = 0.0821 L atm K -1 mol -1 ).

Important Questions on Chemical Thermodynamics

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One mole of monoatomic ideal gas expands adiabatically at initial temperature $T$ against a constant external pressure of 1 atm from 1 L to 2 L. Find out the final temperature $(R = 0.0821 L atm K^{-1} {mol}^{-1}).$