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The ammonia synthesis reaction represented by N2 + 3H2 2NH3; ΔH = - 22.4 kcal, is

A. Endothermic

B. Exothermic

C. Isothermal

D. Adiabatic

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  17. All gases except __________ shows a cooling effect during throttling process at atmospheric temperature…
  18. The absolute entropy for all crystalline substances at absolute zero temperature is
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  20. Sound waves propagation in air exemplifies an __________ process.
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