Modern Approach to Chemical Calculations>Chapter 14 - Chemical Thermodynamics>PROBLEMS>Q 3

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The molar volume of ice and water, respectively, are $0.0196$ and $0.0180$ litres per mole at $273 K$ . If $ΔH$ for the transition of ice to water is $1440$ calories per mole at $1 atm$ pressure, find $ΔU$ .

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Important Questions on Chemical Thermodynamics

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JEE Main

IMPORTANT

Modern Approach to Chemical Calculations>Chapter 14 - Chemical Thermodynamics>PROBLEMS>Q 4

For the reaction,

C_{graphite} + \frac{1}{2} O_{2} (g) \to CO (g)

at

298 K

and

1 atm

,

ΔH = - 26416

cal

. If the molar volume of graphite is

0.0053 L

, calculate

ΔU

.

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JEE Main

IMPORTANT

Modern Approach to Chemical Calculations>Chapter 14 - Chemical Thermodynamics>PROBLEMS>Q 5

One mole of an ideal gas at

300 K

expands isothermally and reversibly from

5

to

20 L

. Calculate the work done and the heat absorbed by the gas.

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Modern Approach to Chemical Calculations>Chapter 14 - Chemical Thermodynamics>PROBLEMS>Q 6

Calculate the heat of formation of ethylene from the following data at $20 ° C$ .

$H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l); ΔH = - 65 kcal$

$C (s) + O_{2} (g) \to {CO}_{2} (g); ΔH = - 97 kcal$

$C_{2} H_{4} (g) + 3 O_{2} (g) \to 2 {CO}_{2} (g) + 2 H_{2} O (l); ΔH = - 340 kcal$

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IMPORTANT

Modern Approach to Chemical Calculations>Chapter 14 - Chemical Thermodynamics>PROBLEMS>Q 7

Calculate the heat of formation of carbon monoxide from the following data:

$C (s) + O_{2} (g) \to {CO}_{2} (g); ΔH = - 94 kcal$

$2 CO (g) + O_{2} (g) \to 2 {CO}_{2} (g); ΔH = - 136 kcal$

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Modern Approach to Chemical Calculations>Chapter 14 - Chemical Thermodynamics>PROBLEMS>Q 8

The heat of combustion of ethyl alcohol is

330 kcal

. If the heat of formation of

{CO}_{2} (g)

and

H_{2} O (l)

are

94.3

and

68.5 kcal

respectively. Calculate the heat of formation of ethyl alcohol.

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JEE Main

IMPORTANT

Modern Approach to Chemical Calculations>Chapter 14 - Chemical Thermodynamics>PROBLEMS>Q 9

The heat of formation of

{CO}_{2} (g)

and

H_{2} O (l)

are

- 94.05 kcal

and

- 68.32 kcal

, respectively. The heat of combustion of methyl alcohol

(l)

is

- 173.65 kcal

. Calculate the heat of formation of liquid methyl alcohol.

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Modern Approach to Chemical Calculations>Chapter 14 - Chemical Thermodynamics>PROBLEMS>Q 10

At constant volume at $27 ° C$ ,

$2 C_{6} H_{6} (g) + 15 O_{2} (g) \to 12 {CO}_{2} (g) + 6 H_{2} O (l); ΔU = - 1600 kcal$

$2 C_{2} H_{2} (g) + 5 O_{2} (g) \to 4 {CO}_{2} (g) + 2 H_{2} O (l); ΔU = - 620 kcal$

Calculate the heat of polymerisation of acetylene to benzene at a constant pressure.

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Modern Approach to Chemical Calculations>Chapter 14 - Chemical Thermodynamics>PROBLEMS>Q 11

Calculate the heat of formation of ${CH}_{3} COOH (l)$ at $25 ° C$ from the following data:

${CH}_{3} COOH (l) + 2 O_{2} (g) \to 2 {CO}_{2} (g) + 2 H_{2} O (l); ΔH = - 208.34 kcal$

$H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l); ΔH = - 68.32 kcal$

$C (s) + O_{2} (g) \to {CO}_{2} (g); ΔH = - 94.05 kcal$