1. Tardigrade
  2. Question
  3. Chemistry
  4. Formation of ammonia is shown by the reaction, N2(g)+3H2(g) → 2NH3(g); ΔrH° = -91.8 kJ mol-1 What will be the enthalpy of reaction for the decomposition of NH3 according to the reaction? 2NH3(g)→ N2(g) + 3H2(g); ΔrH° = ?

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Q. Formation of ammonia is shown by the reaction,
$N_{2\left(g\right)}+3H_{2\left(g\right)} \to 2NH_{3\left(g\right)}$; $\Delta_{r}H^{\circ} = -91.8\,kJ\,mol^{-1}$
What will be the enthalpy of reaction for the decomposition of $NH_3$ according to the reaction?
$2NH_{3\left(g\right)}\to N_{2\left(g\right)} + 3H_{2\left(g\right)}; \Delta_{r}H^{\circ} = ?$

Thermodynamics

Solution:

The sign of $\Delta H$ is reversed.