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• Usaha oleh gas
Proses isotermik n = 2 mol
V2 = 2 V1
T = 127 °C = 400 K
W = __?
Q = __?
Usaha gas (isotermik)
W = n R T ln (V2/V1)
W = (2) (8,3) (400) (0,693)
W = 4,6×10³ J ← jwb
Kalor (isotermal, ∆U = 0)
∆U = Q - W
0 = Q - W
Q = W = 4,6×10³ J ← jwb