1 a thermos bottle contains 36 kg of water and 18 kg of ice, Ask an Expert

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1. A thermos bottle contains 3.6 kg of water and 1.8 kg of ice in thermal equilibrium at 0^oC. How much heat is required to bring the system to thermal equilibrium at 48^oC? Specific heat of water is 4,186 J/kg·°C; latent heat of fusion of water is 3.35 x 10⁵ J/kg.

2. What is the minimum amount of energy required to completely melt a 4.52 kg lead brick which has a starting temperature of 21.4^oC? The melting point of lead is 328^oC. The specific heat capacity of lead is 128 J/kg·°C; and its latent heat of fusion is 23,200 J/kg.

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