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Consider the reaction N2(g)+3H2(g)→2NH3(g) , ΔH =−92.3kJ What will ΔH be for the reaction if it is reversed? Express your answer with appropriate units.

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Answer:

ΔH = +92.3kJ

Explanation:

  • A reversible reaction is a type of reaction that can proceed in a forward direction or in reverse direction.

In this case,

  • An example of a reverse reaction is N₂(g) + 3H₂(g) ⇄ 2NH₃(g) ΔH = -92.3 kJ
  • The enthalpy change of a reaction is given by subtracting the energy of the reactants from that of the products.
  • Therefore, the enthalpy change of a forward reaction will differ from the anthalpy change of the reverse reaction with only the sign.
  • If the reverse reaction is endothermic then the forward reaction is exothermic and vice versa.
  • Therefore, if ΔH = -92.3 kJ for the forward reaction reaction, then the ΔH for the reverse reaction will be +92.3 kJ.

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