Enthalpy of formation of NH3 is - 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH3 → N2 + 3H2, is equal to _____________ kJ/kg. mole?
Correct answer: B. 92
- A. 46
- B. 92
- C. -23
- D. -92
Explanation
Using formation enthalpies, ΔH for decomposition is [0] − 2(−46) = +92 kJ per stoichiometric reaction as written. The positive sign appears because ammonia is being decomposed into its elements.
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