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TERMODINAMIKA• Hukum I
Menurut hukum I Termodinamika,
∆U = Q - W
untuk
∆U = perubahan energi dalam sistem
Q = kalor
• +, sistem menerima kalor
• -, sistem melepas kalor
W = usaha
• +, sistem melakukan usaha
• -, sistem dikenai usaha
a][
Q = - 1800 kal
W = 0 (isokorik)
∆U = Q - W
∆U = (- 1800) - 0
∆U = - 1800 kal = - 7560 J ✔️
b][
Q = 1600 kal = 1600 × 4,2 J
W = 1200 J
∆U = Q - W
∆U = 1600 × 4,2 - 1200
∆U = 5520 J ✔️
c][
Q = - 450 kal = - 450 × 4,2 J
W = - 900 J
∆U = Q - W
∆U = (- 450 × 4,2) - (- 900)
∆U = - 990 J ✔️