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25/09/2021 4:02 pm
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A heat engine carries one mole of an ideal mono-atomic gas around the cycle as shown in the figure. Select the correct option:
(a) qAB = 450 R and qCA = -450 R
(b) qAB = 450 R and qCA = -225 R
(c) qAB = 450 R and qCA = -375 R
(d) qAB = 375 R and qCA = -450 R
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25/09/2021 4:08 pm
Correct answer: (c) qAB = 450 R and qCA = -375 R
Explanation:
For monoatomic gas Cv = \(\frac{3}{2}\)R Cp = \(\frac{5}{2}\)R
At constant volume, ΔU = qv = nCv,m ΔT
At constant pressure, ΔH = qp = nCp,m ΔT