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T = 127 C = 400 K
a. f = 3
Ek = 3/2 kT
Ek = 3/2 (1,38x10^-23*400)
Ek = 828x10^-23 J
U = (n*Na)*Ek
U = (5*6,02x10^23)*828x10^-23
U = 24922,8 J = 24,922 kJ
b. f = 5
Ek = 5/2 (1,38x10^-23*400)
Ek = 1380x10^-23 J
U = (5*6,02x10^23)*1380x10^-23
U = 41538 J = 41,538 kJ