The total of heat transmitted and work performed represents the change in internal energy of a system. Change in internal energy, U is -12166.20876 J .
No. of moles, n = 8.41
Change of temperature, ΔT = T1 - T2
= 395 - 279
= 116 K
For monatomic gas, γ = 5/3
γ -1 = 2 /3
Work done,
plugging values we get
12166.20876 J
Work done, W = + 12166.20876 J
From first law of thermodynamics, dQ = U + W
but, dQ = 0 ( adiabatic process)
Hence, U = - W
= - 12166.20876
Change in internal energy, U = - 12166.20876 J
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