Given: 2.2 kg of dry air. The air is warmed from 17C to 91C. Constant pressure o
ID: 2078543 • Letter: G
Question
Given: 2.2 kg of dry air. The air is warmed from 17C to 91C. Constant pressure of 0.87 atmosphere. Please calculate the following:a) heat absorbed by the gas (b) work done (c) change in internal energy Given: 2.2 kg of dry air. The air is warmed from 17C to 91C. Constant pressure of 0.87 atmosphere. Please calculate the following:
a) heat absorbed by the gas (b) work done (c) change in internal energy Given: 2.2 kg of dry air. The air is warmed from 17C to 91C. Constant pressure of 0.87 atmosphere. Please calculate the following:
a) heat absorbed by the gas (b) work done (c) change in internal energy
Explanation / Answer
molar mass of air=28.97 g
no of moles of air=2200/28.97=75.94 moles
CP for air = 1.00 kJ/kg.K, =28.97 J/mole.K
Cv for air = 0.718 kJ/kg.K=20.8 J/moles.K
heat absorbed=nCp*change in temp=62105.3 J
internal energy=nCv*change in temp=44590.624 J
work done=heat absorbed-internal energy=17514.7 K
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