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For air, at 35°C what is the total enthalpy? (cp=1005 \(\frac {J}{kgK}\)).(a) Zero(b) 309.54 J(c) 309.54 kJ(d) 8977 JI have been asked this question in an online quiz.I need to ask this question from A Brief Review of Thermodynamics in division Compressible Flow – Preliminary Aspects of Aerodynamics

Answer»

The correct option is (d) 8977 J

The explanation: The SPECIFIC enthalpy (h) is GIVEN as h=cpT where T is in Kelvin. This is the enthalpy per unit mass. For TOTAL enthalpy of the air, we need to MULTIPLY h by the molecular mass of air i.e. H=29h which gives total enthalpy equal to 8977 J, irrespective of the PROCESS.



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