1. (a) How much heat transfer is necessary to raise the temperature of a 0.26 -kg piece of ice from -17 °C to 135 °C, including the 20 kJ/s energy needed for phase changes? Specific heat of ice = 2.090 kJ/kg °C Specific heat of water = 4.186 kJ/kg °C Specific heat of steam = 1.520 kJ/kg °C Heat of fusion of water = 334 kJ/kg Heat of vaporization = 2256 kJ/kg (i) Heat needed to warm ice to 0 °C: Q₁: kJ (ii) Heat needed to melt ice at 0 °C: Q₂: kJ (iii) Heat required to warm 0 °C water to 100 °C: Q3 KJ (iv) Heat required to vaporize water at 100 °C: Q₁: kJ (v) Heat required to warm 100 °C vapor to 135 °C: Q5 kJ Total heat, Q (b) How much time is required for the entire process, assuming a constant 20.0 kJ/s rate of heat transfer? Total time, t kJ S
1. (a) How much heat transfer is necessary to raise the temperature of a 0.26 -kg piece of ice from -17 °C to 135 °C, including the 20 kJ/s energy needed for phase changes? Specific heat of ice = 2.090 kJ/kg °C Specific heat of water = 4.186 kJ/kg °C Specific heat of steam = 1.520 kJ/kg °C Heat of fusion of water = 334 kJ/kg Heat of vaporization = 2256 kJ/kg (i) Heat needed to warm ice to 0 °C: Q₁: kJ (ii) Heat needed to melt ice at 0 °C: Q₂: kJ (iii) Heat required to warm 0 °C water to 100 °C: Q3 KJ (iv) Heat required to vaporize water at 100 °C: Q₁: kJ (v) Heat required to warm 100 °C vapor to 135 °C: Q5 kJ Total heat, Q (b) How much time is required for the entire process, assuming a constant 20.0 kJ/s rate of heat transfer? Total time, t kJ S
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