Chemistry - Thermochemistry Question with Solution | TestHub

ChemistryThermochemistryAdiabatic Process/PolytropicMedium2 minPYQ_2020

ChemistryMediumnumerical

Given, $N_{2} (g) + 3 H_{2} (g) \to 2 {NH}_{3} (g);$
$Δ_{r} H^{\circ} = - 92 \cdot 4 kJ {mol}^{- 1}$

What is the magnitude of standard enthalpy of formation of NH₃gas?

Answer:

46.20

Solution:

Given, $N_{2} (g) + 3 H_{2} (g) \to 2 {NH}_{3} (g); Δ_{r} H^{\circ} = - 92 \cdot 4 kJ {mol}^{- 1}$

Chemical reaction for the enthalpy of formation of NH₃(g) is as follows:

$\frac{1}{2} N_{2} (g) + \frac{3}{2} H_{2} (g) \to {NH}_{3} (g)$

Therefore, $Δ_{f} H^{\circ} = \frac{- 92 \cdot 4}{2} = + 46 \cdot 2 kJ {mol}^{- 1}$

Stream:NTA_ABHYASSubject:ChemistryTopic:ThermochemistrySubtopic:Adiabatic Process/Polytropic

⏱ 2mℹ️ Source: PYQ_2020

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