Chemistry Standard 12>Chapter 4 - Chemical Thermodynamics>Exercises>Q 1

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The enthalpy of formation for all elements in their standard states is

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Important Questions on Chemical Thermodynamics

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Chemistry Standard 12>Chapter 4 - Chemical Thermodynamics>Exercises>Q 1

Which of the following reactions is exothermic?

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Chemistry Standard 12>Chapter 4 - Chemical Thermodynamics>Exercises>Q 1

6.24 g

of ethanol are vaporized by supplying

5.89 kJ

of heat. Enthalpy of vaporization of ethanol will be

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Chemistry Standard 12>Chapter 4 - Chemical Thermodynamics>Exercises>Q 1

If the standard enthalpy of formation of methanol is

- 238.9 kJ {mol}^{- 1}

then entropy change of the surroundings will be

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Chemistry Standard 12>Chapter 4 - Chemical Thermodynamics>Exercises>Q 1

Which of the following are not state functions?

1. $Q + W$

2. $Q$

3. $W$

4. $H - TS$

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12th Maharashtra Board

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Chemistry Standard 12>Chapter 4 - Chemical Thermodynamics>Exercises>Q 1

For vaporization of water at 1 bar,

ΔH = 40.63 kJ {mol}^{- 1}

and

ΔS = 108.8 J K^{- 1} {mol}^{- 1}

. At what temperature,

ΔG = 0

?

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Chemistry Standard 12>Chapter 4 - Chemical Thermodynamics>Exercises>Q 1

Bond enthalpies of

H - H, Cl - Cl

and

H - Cl

bonds are

434 kJ {mol}^{- 1}, 242 kJ {mol}^{- 1}

and

431 kJ {mol}^{- 1}

, respectively. Enthalpy of formation of

HCl

is

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Chemistry Standard 12>Chapter 4 - Chemical Thermodynamics>Exercises>Q 2

Comment on the statement: no work is involved in an expansion of gas in vacuum.

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Chemistry Standard 12>Chapter 4 - Chemical Thermodynamics>Exercises>Q 2

State the first law of thermodynamics.