State and Path Variables, Functions

Q. What is inversion temperature?

Q.

What is the degree of freedom for monoatomic gas?

Q.

Which of the following is not a thermodynamic function?

1. Enthalpy

2. Work done

3. Gibbs energy

4. Internal energy

Q.

Explain and give an example of state function.

Q. The intensive property among these quantities is

1. Mass
2. Enthalpy
3. Mass/volume
4. Volume

Q. In thermodynamics which one of the following is not an intensive property

1. Pressure
2. Volume
3. Temperature
4. Density

Q.

Working Capital Is Also Known As

1. Revolving Capital

2. Short Term Capital

3. Circulating Capital

4. All Of These

Q.

Identify the state functions and path functions out of the following: enthalpy, entropy, heat, temperature, work, free energy.

Q. Why enthalpy is a state function . please explain it .

Q.

The density of methane at 2.0 atm pressure and 27 degrees centigrade is

1. $0.13{\mathrm{gL}}^{-1}$

2. $0.26{\mathrm{gL}}^{-1}$

3. $1.30{\mathrm{gL}}^{-1}$

4. $26.0{\mathrm{gL}}^{-1}$

Q.

Are Cyclic Processes Reversible?

Q. Which one is not a state function?

1. Heat (q)
2. Enthalpy
3. Volume
4. Internal Energy (U)

Q.

Name the branch of Science which explains heat energy

Q.

A thermodynamic state function is a quantity
(i) used to determine heat changes
(ii)whose value is independent of path
(iii) used to determine pressure volume work
(iv) whose value depends on temperature only.

Q. The amount of heat energy Q, used to heat up a substance depends on its mass m, its specific heat capacity (s) and change in of the substance using dimensional method find expression for s is

Q. The incorrect option for cyclic process for an ideal gas is:

1. $\Delta H=0$
2. $W=0$
3. $\Delta U=0$
4. $\Delta S=0$

Q. Work done on or by a gas, in general depends upon the

1. Final state only
2. Both initial and final states only
3. Initial state, final state and the path
4. Initial state only

Q.

Why the value of R is 2 calories here?

Question:

Heat of reaction for C6H12O6(s) + 6O2 → 6CO2(g) + 6H2O(v)at constant pressure is −651 K cal at 17∘ C. What is the heat of reaction at constant volume at 17∘ C?

Chemistry Chemical Thermodynamics Thermochemistry

Solution:

We know that Δ H = Δ U + Δ nRT

Given Δ H = −651 × 103cal; R = 2 calorie

T = 290K; Δ n = 6 + 6 − 6 = 6

∴ −651 × 103 = Δ U + 6 × 2 × 290

Δ U = −654.48 kcal

Q. Among the following, the state functions is/are :

1. Internal energy
2. Irreversible expansion work
3. Reversible expansion work
4. Molar enthalpy

Q. The osmotic pressure of 5% (mass/volume) solutionof cane sugar at 50^° C is(1) 2.51 atm(2) 3 atm(3) 3.88 atm(4) 3.45 atm

Q. Any series of operations so carried out that at the end, the system is back to its initial state is called

1. Reversible process
2. Adiabatic process
3. Cyclic process
4. Boyle's cycle

Q. Conditions of standard state used in thermochemistry is

1. ${20}^{\circ }C$ and 1 atm
2. $0^{\circ }C$ and 1 atm
3. ${25}^{\circ }C$ and 1 atm
4. 0 K and 1 atm

Q.

In which of the basic thermodynamic process work done is always zero?

Q.

What Is enthalpy and entropy?

Q.

What is the value of H?

Q.

Choose the correct answer. A thermodynamic state function is a quantity

(i) used to determine heat changes

(ii) whose value is independent of path

(iii) used to determine pressure volume work

(iv) whose value depends on temperature only.

Q. Among the following the state function is:

1. Internal energy
2. All of the above
3. Heat at constant volume
4. Work in adiabatic process

Q. Which of the following is a perfect differential

1. dq
2. dw
3. Both a and b
4. dU

Q. Find the volume of the Gas obtained from 2 ml solid lump of $C{O}_2$ at ${27}^{\circ }C$ and 2 atmospheric pressure, when density of solid $C{O}_2$ is 1.53 gm/ml

1. 0.24 litre
2. 8.05 litre
3. 0.2 litre
4. 0.86 litre

Q. Identify the Quantity which is a State function out of the following:

1. q

2. q/w

3. q × w

4. q + w