Ans: 0°C
Plz answer with steps , thz =]
更新1:
sorry~ i kg should be 1 kg
latent heat
2007-10-20 1:49 am
0.5kg of ice at 0°C is mixed with i kg of water at 20°C. Assume that there's no heat lost to the surroundings. Find the final temperature of the mixture.
Ans: 0°C
Plz answer with steps , thz =]
Ans: 0°C
Plz answer with steps , thz =]
回答 (1)
2007-10-20 8:37 am
✔ 最佳答案
Heat required to melt all the 0.5 kg ice = 0.5 x 334 kJ = 167 kJwhere 334 kJ/kg is the specific latent heat of fusion of ice.
Heat given out by the 1 kg water when its temperature drops to 0 deg.C
= 1 x 4200 x 20 J = 84,000 J = 84 kJ
Thus the heat given out by the water is not sufficient to melt ALL the 0.5 kg of ice (in fact, only 0.25 kg of ice is melted). The final ice and water mixture is thus at 0 deg.C
收錄日期: 2021-04-29 17:25:12
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