The work done in ergs for the reversible expansion of one mole of an ideal gas from a volume of 10 litres to 20 litres at 25 ° C is

298 × 10 7 × 8 . 31 × 2 . 303 log 2 .

2 . 303 × 298 × 0 . 082 log 2 .

2 . 303 × 298 × 0 . 082 log 0 . 5 .

8 . 31 × 10 7 × 298 × 2 . 303 log 0 . 5 .

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The heat of combustion of carbon and carbon monoxide are $- 393.5$ and $- 283.5 kJ {mol}^{- 1}$ , respectively. The heat of formation (in $kJ$ ) of carbon monoxide per mole is:

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Important Questions on Thermodynamics

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 102

Given

$C_{(graphite)} + O_{2} (g) \to {CO}_{2} (g); Δ_{r} H ° = - 393.5 kJ {mol}^{- 1}$

$H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l); Δ_{r} H ° = - 285.8 kJ {mol}^{- 1}$

${CO}_{2} (g) + 2 H_{2} O (l) \to {CH}_{4} (g) + 2 O_{2} (g); Δ_{r} H ° = + 890.3 kJ {mol}^{- 1}$

Based on the above thermochemical equations, the value of $∆_{r} H^{o}$ at $298 K$ for the reaction

$C_{(graphite)} + 2 H_{2} (g) \to {CH}_{4} (g)$ will be:

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 103

ΔU

equal to:

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 104

The combustion of benzene

(l)

gives

{CO}_{2} (g)

and

H_{2} O (l) .

Given that heat of combustion of benzene at constant volume is

- 3263 .9 kJ {mol}^{- 1}

25 ° C;

the heat of combustion

(in kJ {mol}^{- 1})

of benzene at constant pressure will be

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

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 105

A process has

ΔH = 200 {Jmol}^{- 1}

and

ΔS = 40 {JK}^{- 1} {mol}^{- 1}

, Out of the values given below, choose the minimum temperature above which the process will be spontaneous:

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 106

An ideal gas undergoes isothermal compression from

5 m^{3}

1 m^{3}

against a constant external pressure of

4 {Nm}^{- 2}

. The heat released in this process is used to increase the temperature of

1 mole

Al

. If molar heat capacity of

Al

24 {Jmol}^{- 1} K^{- 1}

, the temperature of

Al

increases by:

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 107

For the chemical reaction

X ⇌ Y

, the standard reaction Gibbs energy depends on temperature

T

(in

K

) as

Δ_{r} G °

(in

kJ {mol}^{- 1}

)

= 120 - \frac{3}{8} T

. The major component of the reaction mixture

T

is:

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 108

The standard reaction Gibbs energy for a chemical reaction at an absolute temperature

T

is given by

ΔG ° = A - BT

where

A

and

B

are non-zero constants. Which of the following is

TRUE

about this reaction?

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 109

The reaction,

MgO (s) + C (s) \to Mg (s) + CO (g)

, for which

ΔrH ° = + 491.1 kJ {mol}^{- 1}

and

Δr ° = 198.0 {JK}^{- 1} {mol}^{- 1}

, is not feasible at

298 K

. Temperature above which reaction will be feasible is:

The heat of combustion of carbon and carbon monoxide are -393.5 and -283.5 kJ mol-1, respectively. The heat of formation (in kJ) of carbon monoxide per mole is:

Important Questions on Thermodynamics

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The heat of combustion of carbon and carbon monoxide are $- 393.5$ and $- 283.5 kJ {mol}^{- 1}$ , respectively. The heat of formation (in $kJ$ ) of carbon monoxide per mole is: