Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 5>Q 4

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Two moles of a monoatomic ideal gas is expanded irreversibly and isothermally at $T$ Kelvin until its volume is doubled and $q$ Joules heat is absorbed from surroundings. ${ΔS}_{total} (J / K)$ (system $+$ surrounding) is:

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Important Questions on Thermodynamics

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 5>Q 5

What is the change in entropy when 2.5 mol of water is heated from

27 ° C

to

87 ° C

? Assume that the heat capacity is constant.

[C_{p, m} (H_{2} O) = 4.2 J / g . K] (l n (1.2) = 0.18)

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 5>Q 6

For a reaction

A (g) \cdot B (g)

at equilibrium. The partial pressure of

B

is found to be one fourth of the partial pressure of

A

. The value of

ΔG °

of the reaction

A B

is

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 5>Q 7

One mole of an ideal diatomic gas

(C_{v} = 5 cal)

was transformed from initial

25 ° C

and

1 L

to the state when temperature is

100 ° C

and volume

10 L

. The entropy change of the process can be expressed as

(R = 2

calories / mol / K

)

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 5>Q 8

For the following reaction,

C_{Diamond} + O_{2} (g) \to {CO}_{2} (g); ΔH = - 94.0 kcal

C_{Graphite} + O_{2} (g) ⟶ {CO}_{2} (g); ΔH = - 97.6 kcal

The heat réquired to change

1 g

of

C

,

\to C_{graphite}

is

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 5>Q 9

$C (s) + O_{2} (g) ⟶ {CO}_{2}, (g); ΔH = - 94.3 kcal / mol$

$CO (g) + \frac{1}{2} O_{2} (g) ⟶ {CO}_{2} (g); ΔH = - 67.4 kcal / mol$

$O_{2} (g) \to 2 O (g); ΔH = 117.4 kcal / mol$

$CO (g) ⟶ C (g) + O (g);$ $ΔH = 230.6 kcal / mol$
Calculate $ΔH$ for $C$ (s) $⟶ C$ (g) in $kcal / mol$ .

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 5>Q 10

During isothermal expansion of one mole of an ideal gas from

10

atm to

1

atm at

273 K

, the work done
is : (gas constant =

2

)

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 5>Q 11

One mole of an ideal gas for which

C_{v} = 3 / 2 R

is heated reversibly at a constant pressure of

1

atm from

25 ° C

to

100 ° C .

The

ΔH

is

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 5>Q 12

The heat of reaction for

$C_{10} H_{8} (s) + 12 O_{2} (g) ⟶ 10 {CO}_{2} (g) + 4 H_{2} O (l)$ at constant volume is $- 1228.2 kcal$ at $25^{0} C$ . The heat of reaction at constant pressure and same temperature is