(3%) Problem 30: Suppose you want to raise the temperature of a 0.185-kg piece o
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Question
(3%) Problem 30: Suppose you want to raise the temperature of a 0.185-kg piece of ice from -20.0°C to 130°C. The heat of fusion is Lf 334 kJ/kg, and the heat of vaporization is L 2256 kJ/kg Specific heat (c Substances Solids Aluminum Concrete Copper Glass Ice (average) 900 840 387 840 2090 kcal/kg.C 0.215 0.20 0.0924 0.20 0.50 Liquids Water 4186 1.000 Gases Steam (100°C) 1520 (2020)0.363(0.482) ©theexpertta.com > 50% Part (a) How much heat, in kilocalories, must be transferred for this to happen, including the energy needed for phase changes? Grade Summa Deductions Potential ry 090 100% cosO tanO ( acosO Sin Submissions Attempts remaining: 35 (500 per attempt) detailed view cotanasin0 acotanOsinh atan cosh0 anh cotanhO END Degrees Radians CLEAR Submit Hint I give up! Hints: 2% deduction per hint. Hints remaining Feedback: 290 deduction per feedback. 50% Part (b) How much time, in seconds, is required to do this, assuming a constant 20.0 kJ s rate of heat transfer?Explanation / Answer
a)
Heat required to raise the temperature of 0.185 kg of ice from -20oC to 130oC is
Q=mCice(0-(-20)) +mLf +mCwater(100-0) +mLV + mCsteam(130-100)
Q=0.185*2090*20 +0.185*334*103+ 0.185*4186*100 +0.185*2256*103+0.185*2020*30
Q=575,535 J =575.535 KJ
in Kcal
Q=575.535/4.186 =137.5 Kcal
b)
Time required to do this
T=575.535/20 =28.7768 s
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