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aivan3 [116]
3 years ago
7

sebongkah es dengan massa 200 gram memiliki suhu -5 c. jika es tersebut ingin diubah menjadi air yang bersuhu 20 c, berapakah ka

lor yang harus diberikan? (kalor jenis air = 4200 J/kg, kalor jenis es = 2100 J/kg, dan kalor lebur es = 336 KJ/kg)
Physics
1 answer:
dlinn [17]3 years ago
5 0

Answer:

86100\ \text{J}

Explanation:

m = Massa es = 200 g

c_w = Kalor jenis air = 4200\ \text{J/kg}^{\circ}\text{C}

c_i = Kalor jenis es = 2100\ \text{J/kg}^{\circ}\text{C}

L_f = Kalor laten fusi es = 336\ \text{kJ/kg}

\Delta T_w = Perubahan suhu air = (20-0)^{\circ}\text{C}

\Delta T_i = Perubahan suhu es = (0-(-5))^{\circ}\text{C}

Panas yang dibutuhkan diberikan oleh

Q=mc_w\Delta T_w+mL_f+mc_i\Delta T_i\\\Rightarrow Q=m(c_w\Delta T_w+L_f+c_i\Delta T_i)\\\Rightarrow Q=0.2(4200\times (20-0)+336000+2100\times (0-(-5)))\\\Rightarrow Q=86100\ \text{J}

Panas yang dibutuhkan untuk mencairkan es hingga suhu air yang dibutuhkan adalah 86100\ \text{J}

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