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Class XI Chemistry Thermodynamics Quiz 4

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Question 1

Only at extremely high pressure does ∆H-∆U for condensed state reactions becomes significantly different than zero. Determine the pressure in bar at which ∆H-∆U is equal to -1kJ for the reaction of graphite to diamond. For graphite and diamond densities are 2.25 gm/cc and 3.51gm/cc respectively.

Question 2

An ideal gas is at constant pressure p and temperature T in a box which is kept in vacuum with in a large container. The wall of box is punctured. What happens as the gas escapes through the holes?

Question 3

Heats of combustion of methane , carbon and hydrogen are – 212, – 94, – 68 kcal/mol. The heat of formation of CH₄ is ____

Question 4

From the following data, calculate the enthalpy change for the combustion of cyclopropane at 298K. The enthalpy of formation of CO₂ (g) H₂O (l) and propene (g) are – 395.5, – 285.8 and 20.42 kJ/mol respectively. The enthalpy of isomerisation of cyclopropane to propene is – 33.0 kJ/mol is …..

Question 5

For which of the following process is the entropy change zero?

Question 6

Which of the following is an extensive property?

Question 7

When a gas expands from 1.5L to 6.5L against a constant pressure of 0.5atm and during this process, the gas also absorbs 100J of heat. ΔU=?

Question 8

The magnitude of enthalpy changes for reversible adiabatic expansion of a gas from a volume V₁ to V₂(in L) is ΔH₁ and for irreversible adiabatic expansion for the same _expansion is ΔH₂. Then

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