minta tolong yang bisa No 12 sama caranya

Diket:
V tangki = 0,5m³
n = 4 mol
T = 27'c = 27 + 273 = 300K
R = 8,314 J/molK (tetapan)
Ditanya:
a. Ek total (NEk).....?
jawab:
a. 
NEk = 3/2 n R T
NEk = 3/2 . 4 . 8,314 . 300
NEk = 14965,2 J

V= 0,5m³
n= 5 mol
T= 27°C = 300K
R = 8,314 J/molK

Maka,
Ek = 3/2 n R T
Ek = 3/2 . 5 . 8,314 . 300
Ek = 18.706,5 J (D)