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The heat of reaction for $P_{4} (white, s) + 6 {Cl}_{2} (g) - 4 {PCl}_{3} (l)$ is $- 1280 kJ$ . What is the heat of formation of ${PCl}_{3} (in kJ / mol)$ ?

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Important Questions on Thermodynamics

EASY

Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

The value of

∆ H

for the combustion of

C (s)

- 94.0 kcal

. The heat of formation of

{CO}_{2} (g)

EASY

Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

The heat of combustion of carbon to

C O_{2}

- 393

kJ/mol. The heat released upon formation of 35.2 g of

C O_{2}

from carbon and oxygen gas is

EASY

Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

The enthalpy of formation of

N H_{3}

is -46 kJ

m o l^{- 1}

. The enthalpy change for the reaction

2 N H_{3} (g) \to N_{2} (g) + 3 H_{2} (g)

EASY

Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

48 g of C (diamond) on complete combustion evolves 1584 kJ of heat. The standard heat of formation of gaseous carbon is 725 kJ/mol. The energies required for the process.
(i) C (Graphite)

\to

C(Gas)
(ii) C (Diamond)

\to

C(Gas) are :

EASY

Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

For the reaction,

P C l_{5} (g) \to P C l_{3} (g) + C l_{2} (g)

EASY

Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

The heat evolved in the combustion of methane is given by the following equations

{CH}_{4 (g)} + 2 O_{2 (g)} \to {CO}_{2 (g)} + 2 H_{2} O (l); Δ H = - 890 .3 kJ

How many grams of methane would be required to produce

444.15 kJ

of heat of combustion?

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Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

Which is wrong statement ?

EASY

Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

The bond energy

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

C - C

single bond is approximately

EASY

Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

Enthalpy of solution of

N a O H

(solid) in water is

- 41.6 k J m o l^{- 1}

, when

N a O H

is dissolved in water, the temperature of water

EASY

Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

The bond dissociation energies of gaseous

H_{2}, C l_{2}

and HClare 104, 58 and 103 kcal respectively. The enthalpy of formation of HClgas would be

EASY

Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

Energy required to dissociate 4g of gaseous hydrogen into free gaseous atoms is 208 kcal at 25

℃

. The bond energy of

H - H

will be

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

The standard enthalpy of formation

(∆ H_{f}^{o})

298 K

for methane,

C H_{4} (g) i s - 78.4 k J {m o l}^{- 1}

. The additional information required to determine the average energy for

C - H

bond formation would be

EASY

Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

The heat of formations of

C O (g)

and

C O_{2} (g)

are

- 26.4

kcal and

- 94.0

kcal respectively. The heat of combustion of carbon monoxide will be

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

The bond energy of an

O - H

bond is

109 kcal / mol

. When a mole of water is formed, then

EASY

Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

Enthalpy of solution of

NaOH

(solid) in water is

- 41.6 k J m o l^{- 1}

. When

NaOH

is dissolved in water, the temperature of water

EASY

Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

Heat of formation of

S O_{2}

- 298 k J

. What is the heat of combustion of 4 g of S?

EASY

Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

Heat of combustion of a substance:

EASY

Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

∆ U^{⊖}

of combustion of methane is

- X {kJmol}^{- 1}

. The value of

∆ H^{⊖}

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

For

N a C l

, lattice

e n e r g y = - 186 k c a l / m o l

, the solvation energy of

{N a}^{+}

and

{C l}^{-}

are

- 97

and

- 85 k c a l / m o l e

, respectively.Therefore, for

N a C l (s)

EASY

Chemistry>Physical Chemistry>Thermodynamics>Enthalpies for Different Types of Reactions

In the combustion of 2.0 g of methane, 25 kcal heat is liberated. Heat of combustion of methane would be

The heat of reaction for P4 (white, s) + 6Cl2(g) - 4PCl3(l) is - 1280 kJ. What is the heat of formation of PCl3 (in kJ/mol)?

Important Questions on Thermodynamics

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The heat of reaction for $P_{4} (white, s) + 6 {Cl}_{2} (g) - 4 {PCl}_{3} (l)$ is $- 1280 kJ$ . What is the heat of formation of ${PCl}_{3} (in kJ / mol)$ ?