During the isothermal mixing of ideal gases at pressure, p, the entropy change per mole for the mixing process is-R xi ln xi where x1, x2,....,xi are the mole fractions of the components, 1, 2,....,i of the mixture. Assuming ideal gas behavior, calculate S for the mixing of 0.8 mole of N2 and 0.2 mole of O2.(at 25C and 0.9 atm) [1 eu = cal/deg]

1. 0.9943 eu

2. 0.7533 eu

3. 0.6798 eu

4. 0.7112 eu

Concept Questions :-

Spontaneity and Entropy
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An ideal gas can be expanded from an initial state to a certain volume through two different processes, (A) PV2=K (B) P=KV2, where K is a positive constant. Then, choose the correct option from the following.

1. Final temperature in (A) will be greater than in (B)

2. Final temperature in (B) will be greater than in (A)

3. Work done by the gas in both the processes would be equal

4. Total heat given to the gas in (A) is greater than in (B)

Concept Questions :-

Extensive and Intensive Properties
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For the reaction : X2O4l2XO2gE=2.1 kcal. S=20 cal/K at 300 K. Hence G is :

1. 2.7 kcal

2. -2.7 kcal

3. 9.3 kcal

4. -9.3 kcal

Concept Questions :-

Gibbs Energy Change
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Heat of hydrogenation of ethene is x1 and that of benzene is x2. Hence resonance energy is-

1. x1-x2

2. x1+x2

3. 3x1-x2

4. x1-3x2

Concept Questions :-

Thermochemistry
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Which of the following statement is true if the reaction quotient, Q is equal to 1 ?

1. G=0

2. G=0

3. S=0

4. G=G

Concept Questions :-

Gibbs Energy Change
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C2H6g+3.5O2g2CO2g+3H2OgSvapH2O, l=x1 cal K-1b.p. +T1HfH2O, l=x2; HfCO2=x3, HfC2H6=x4Hence H for the reaction is-

1. 2x3+3x2-x4

2. 2x3+3x2-x4+3x1T1

3. 2x3+3x2-x4-3x1T1

4. x1T1+x2+x3-x4

Concept Questions :-

Enthalpy and It's Type
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The bond energies ofCC, C-H, H-H and C=C are 198, 98, 103 and145 kcal respectively. The enthalpy change of the reaction HCCH+H2C2H4 is

1. 48 kcal

2. 96 kcal

3. -40 kcal

4. -152 kcal

Concept Questions :-

Enthalpy and It's Type
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H2g+12O2gH2Ol

B.E. (H-H) = x1; B.E. (O=O) = x2 B.E. (O-H) = x3

Latent heat of vaporization of water liquid into water vapour = x4, then Hf(heat of formation of liquid water) is-

1. x1+x22-x3+x4

2. 2x3-x1-x22-x4

3. x1+x22-2x3-x4

4. x1+x22-2x3+x4

Concept Questions :-

Enthalpy and It's Type
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In a process the pressure of a gas is inversely proportional to the square of the volume. If temperature of the gas is increases, then work done on the gas-

1. is positive

2. is negative

3. is zero

4. may be positive

Concept Questions :-

Thermodynamics' Properties and process
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The enthalpies of formation of CO2(g) and CO(g) at 298 K are in the ratio 2.57 : 1. For the reaction,

CO2g+Cs2 COg, H=172.5 kJ,Hf of COg is

1. -150.6 kJ mol-1

2. -109.8 kJ mol-1

3. -130.2 kJ mol-1

4. -141.8 kJ mol-1

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