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How many changes at constant pressure is work done by the surrounding on system?

Initial state Final state

(i) $H_{2} O (g)$ $\to$ $H_{2} O (l)$

(ii) $H_{2} O (s)$ $\to$ $H_{2} O (g)$

(iii) $H_{2} O (l)$ $\to$ $H_{2} O (s)$

(iv) $3 H_{2} (g) + N_{2} (g)$ $\to$ $2 {NH}_{3} (g)$

(v) ${CaCO}_{3} (s)$ $\to$ $CaO (s) + {CO}_{2} (g)$

(vi) $2 O_{3} (g)$ $\to$ $3 O_{2} (g)$

(vii) $N_{2} O_{4} (g)$ $\to$ $2 {NO}_{2} (g)$

(viii) $A (g) + B (g)$ $\to$ $C (g)$

(ix) $2 C_{6} H_{6} (l) + 15 O_{2} (g)$ $\to$ $12 {CO}_{2} (g) + 6 H_{2} O (l)$

(x) ${CH}_{4} (g) + 2 {Cl}_{2} (g)$ $\to$ ${CCl}_{4} (l) + 2 H_{2} (g)$

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Important Questions on Thermodynamics

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Beta Question Bank for Engineering: Chemistry>Chapter 4 - Thermodynamics>EXERCISE-3>Q 13

The gas is cooled and loses

65 J

of heat. The gas contracts as it cools and work done on the system equal to

20 J

which is exchanged with the surroundings. What is the value of

∆ E

(in joules)?

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Beta Question Bank for Engineering: Chemistry>Chapter 4 - Thermodynamics>EXERCISE-3>Q 14

The enthalpy of combustion of glucose is $- 2808 kJ {mol}^{- 1}$ at $25 ° C$ . How many grams of glucose do you need to consume to climb a mountain of altitude $3000 m$ ? [Assume your $wt = 62.5 kg$ ] $(g = 10 m \sec^{- 2})$

Assume that $25 %$ of enthalpy can be converted to useful work.

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Beta Question Bank for Engineering: Chemistry>Chapter 4 - Thermodynamics>EXERCISE-3>Q 15

What is

∆ E

kJ

when

2.0 mole

of liquid water vaporises at

100 ° C

? The heat of vaporisation,

(∆ H vap .)

of water at

100 ° C

40.66 kJ {mol}^{- 1}

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Beta Question Bank for Engineering: Chemistry>Chapter 4 - Thermodynamics>EXERCISE-3>Q 16

1.0 kcal

of heat is added to

1.2 L

O_{2}

in a cylinder at constant pressure of

1 atm

, the volume increases to

1.5 L

. Calculate

∆ E

of the process in

kJ

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Beta Question Bank for Engineering: Chemistry>Chapter 4 - Thermodynamics>EXERCISE-3>Q 17

When the following reaction was carried out in a bomb calorimeter, $∆ E$ is found to be $- 742.7 kJ {mol}^{- 1}$ of ${NH}_{2} CN (s)$ at $298 K$ .

${NH}_{2} CN (s) + \frac{3}{2} O_{2} (g) \to N_{2} (g) + {CO}_{2} (g) + H_{2} O (l)$

Calculate $∆ H_{298}$ for the reaction in $kJ {mole}^{- 1}$ .

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Beta Question Bank for Engineering: Chemistry>Chapter 4 - Thermodynamics>EXERCISE-3>Q 18

When

1 mole

of ice melt at

0 ° C

and at constant pressure of

1 atm

1440

calories of heat are absorbed by the system. The molar volumes of ice and water are

0.0196

and

0.0180

litre respectively. Calculate

∆ E

for the reaction in kcal.

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Beta Question Bank for Engineering: Chemistry>Chapter 4 - Thermodynamics>EXERCISE-3>Q 19

Water expands when it freezes. Determine amount to work (in joules), done when a system consisting of

1.0 L

of liquid water freezes under a constant pressure of

1.0 atm

and form

1.1 L

of ice.

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Beta Question Bank for Engineering: Chemistry>Chapter 4 - Thermodynamics>EXERCISE-3>Q 20

One mole of solid $Zn$ is placed in excess of dilute $H_{2} {SO}_{4}$ at $27 ° C$ in a cylinder fitted with a piston. Find the value of $∆ E (in kJ)$ for the process if the area of piston is $500 {cm}^{2}$ and it moves out by $50 cm$ against a pressure of $1 atm$ during the reaction. The heat given to surrounding is $36.5 kJ$ .

$Zn (s) + 2 H^{+} (aq) ⇌ {Zn}^{2 +} (aq) + H_{2} (g)$

Give answer in 2 decimal places.

	Initial state		Final state
(i)	$H_{2} O (g)$	$\to$	$H_{2} O (l)$
(ii)	$H_{2} O (s)$	$\to$	$H_{2} O (g)$
(iii)	$H_{2} O (l)$	$\to$	$H_{2} O (s)$
(iv)	$3 H_{2} (g) + N_{2} (g)$	$\to$	$2 {NH}_{3} (g)$
(v)	${CaCO}_{3} (s)$	$\to$	$CaO (s) + {CO}_{2} (g)$
(vi)	$2 O_{3} (g)$	$\to$	$3 O_{2} (g)$
(vii)	$N_{2} O_{4} (g)$	$\to$	$2 {NO}_{2} (g)$
(viii)	$A (g) + B (g)$	$\to$	$C (g)$
(ix)	$2 C_{6} H_{6} (l) + 15 O_{2} (g)$	$\to$	$12 {CO}_{2} (g) + 6 H_{2} O (l)$
(x)	${CH}_{4} (g) + 2 {Cl}_{2} (g)$	$\to$	${CCl}_{4} (l) + 2 H_{2} (g)$

Important Questions on Thermodynamics

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