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For hypothetical reaction -
A(g) + B (g) → C (g) + D (g)
Which of the following statements is correct -
- a)ΔH = ΔE
- b)ΔH > ΔE
- c)ΔH < ΔE
- d)unpredictable
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
For hypothetical reaction -A(g) + B (g) →C (g) + D (g)Which of th...
Explanation:
Definition of ΔH and ΔE:
- ΔH represents the change in enthalpy of a system during a reaction, which is the heat transfer at constant pressure.
- ΔE represents the change in internal energy of a system during a reaction, which is the heat transfer at constant volume.
Relationship between ΔH and ΔE:
- In the given reaction, since the reactants and products are all in the gaseous phase, there is no change in volume during the reaction. Therefore, the reaction can be assumed to occur at constant volume.
- At constant volume, the change in enthalpy (ΔH) is equal to the change in internal energy (ΔE) plus the product of pressure and change in volume (ΔV), but as there is no change in volume, ΔH is equal to ΔE.
- Hence, the correct statement is ΔH = ΔE.
Therefore, option 'a' is correct, and the relationship between ΔH and ΔE in this hypothetical reaction is that they are equal due to the constant volume assumption.
Definition of ΔH and ΔE:
- ΔH represents the change in enthalpy of a system during a reaction, which is the heat transfer at constant pressure.
- ΔE represents the change in internal energy of a system during a reaction, which is the heat transfer at constant volume.
Relationship between ΔH and ΔE:
- In the given reaction, since the reactants and products are all in the gaseous phase, there is no change in volume during the reaction. Therefore, the reaction can be assumed to occur at constant volume.
- At constant volume, the change in enthalpy (ΔH) is equal to the change in internal energy (ΔE) plus the product of pressure and change in volume (ΔV), but as there is no change in volume, ΔH is equal to ΔE.
- Hence, the correct statement is ΔH = ΔE.
Therefore, option 'a' is correct, and the relationship between ΔH and ΔE in this hypothetical reaction is that they are equal due to the constant volume assumption.
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