ALL IN ONE ISC Chemistry CLASS 11>Chapter 6 - Thermodynamics>Chapter Practice>Q 8

EASY

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IMPORTANT

Earn 100

Will the change in enthalpy of the system be zero in an adiabatic process?

Important Questions on Thermodynamics

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IMPORTANT

ALL IN ONE ISC Chemistry CLASS 11>Chapter 6 - Thermodynamics>Chapter Practice>Q 9

Calculate the enthalpy of formation of methane from the following data.

$C (s) + O_{2} (g) \to {CO}_{2} (g); Δ_{r} H = - 393.5 k J$

$H_{2} (g) + O_{2} (g) \to 2 H_{2} O (l); Δ_{r} H ° = - 571.8 k J$

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

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ALL IN ONE ISC Chemistry CLASS 11>Chapter 6 - Thermodynamics>Chapter Practice>Q 10

How does Hess's law help in calculating the enthalpy change for the conversion of diamond to graphite?

HARD

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ALL IN ONE ISC Chemistry CLASS 11>Chapter 6 - Thermodynamics>Chapter Practice>Q 11

The enthalpy of formation of

{CH}_{4}, C_{2} H_{6} and C_{4} H_{10}

are

- 74.8, - 84.7

and

- 126.1 kJ {mol}^{- 1}

respectively
Arrange them in the order of their efficiency as fuel per gram (enthalpy of formation of

{CO}_{2} (g)

and

H_{2} O (l)

are -

393.5

and

- 285.8 kJ {mol}^{- 1}

respectively.

EASY

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ALL IN ONE ISC Chemistry CLASS 11>Chapter 6 - Thermodynamics>Chapter Practice>Q 12

When

0.532 g

of benzene C.(H.)

(C_{6} H_{6})

boiling point

353 K

, is burnt with excess of oxygen in a constant volume system,

22.3 kJ

of heat is given out. Calculate

∆ H

for the combustion process

(R = 8.31 J K^{- 1} mol - 1)

.

EASY

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ALL IN ONE ISC Chemistry CLASS 11>Chapter 6 - Thermodynamics>Chapter Practice>Q 13

Is it possible for any process to have

∆ H = ∆ E

? If yes, state under what conditions? If no, state why not?

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ALL IN ONE ISC Chemistry CLASS 11>Chapter 6 - Thermodynamics>Chapter Practice>Q 14

Calculate the work done when

1.0 mole

of water at

373 K

vaporises against an atmospheric pressure of

1.0

atmosphere. Assume ideal gas behaviour.

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ALL IN ONE ISC Chemistry CLASS 11>Chapter 6 - Thermodynamics>Chapter Practice>Q 15

Height of a hill is a state functions or not and why?

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IMPORTANT

ALL IN ONE ISC Chemistry CLASS 11>Chapter 6 - Thermodynamics>Chapter Practice>Q 15

Distance travelled in climbing the hill is a state functions or not and why?