how much heat in calories is needed to change a 20 gram ice cube at -20c to wate

Question

how much heat in calories is needed to change a 20 gram ice cube at -20c to water at 10 ,tue hal t le Hhal temperature is 90°C. What is the specific heat? temperature is 90°c. Wh Give correct units also. 3) A bathtub contains 70kg of water at 26C. If 20kg of water at 90°C are poured in, what is the final temperature of the mixture? Neglect the heat absorbed by the bathtub. Cwate 4190J/(kg.C) 4) How much heat in calories is needed to change a 20gram ice cube at -20°C to water at 10°C? Cice= .5 cal/(gm.°C) Cice .5 cal/(gm.°C) L80cal/gm Cwater 1 cal/(gm°C) Lf-80cal/gm cwater-l cal/(gm-°C) heat lost heat gained

Explanation / Answer

4)

Q = mice cice (0 - (-20)) + mice L + mwater cwater (10 - 0)

Q = 20 (0.5) (20) + (20) (80) + (20) (1) (10) = 2000 cal

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