Kalor sebanyak 84 kJ ditambahkan pada 500 g air yang bersuhu 20 derajat celcius. Menjadi berapakah suhu air itu? Kalor jenis air 4.200J/(Kg.K)
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84000J = 0,5kg . 4200J(kg.K) . (t2 - 293K)
84000J = 2100 (t2 - 293K)
84000/2100 = t2 - 293K
40 = t2 - 293K
t2 = 333K
= 60 c
Q=84kj ⇒84000
m=500g ⇒ 0,5 kg
c= 4200 J(kg.K)
t₁=20
Dit=t₂
jwb=
Q=m.c.ΔT
84000=0,5.4200.(t₂-t₁)
84000=2100(t₂-20)
84000=2100t₂-42000
84000+42000=2100t₂
126000=2100t₂
t₂= 126000
2100
t₂=60°