Enthalpy of formation of NH3 is – 46 kJ/kg mole. The enth... — Answer & Explanation | PrepBeePakistan

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HomeMCQsChemical Engineering

MEDIUMENGLISHChemical Engineering

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: D

Explanation

The reaction is the reverse of formation. $\Delta H = -2 \times (\text{Enthalpy of formation}) = -2 \times (-46) = 92$ kJ/kmol.

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