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Social ScienceHow much energy needs to be added in the form of heat to turn a 50 kg block of ice at -20 deg C into steam at 135 deg C? Lf=333 kJ/kgLv=2256 kJ/kg Cice=2.108 kJ/KgdegC Cwater=4.187 kJ/kgdegC Csteam=1.996kJ/kgdegC
How much energy needs to be added in the form of heat to turn a 50 kg block of ice at -20 deg C into steam at 135 deg C?
Lf=333 kJ/kg
Lv=2256 kJ/kg Cice=2.108 kJ/KgdegC Cwater=4.187 kJ/kgdegC Csteam=1.996kJ/kgdegC
Expert Answer
Energy needed to change the temperature of ice from -20 deg C to 0 deg C is
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Е 3 т,ДТ 1ce 10 /kg.C (0°С - (-20°C)) 2.108 KJx = (50kg) 1kJ 103J = (50kg 2.108 KJx 1kJ kg.C (20°C) 2108000J
Energy needed to convert 50 kg of ice into water at 0 deg C is
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EmL 103J (50kg) 333 KJx /kg 1kJ 16650000J
Energy needed to change temperature of w...
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Е, - тс в АТ water 103J /kg. °C(100°C-0°C) 1kJ = (50kg) 4.187 KJ: 103 /kg. °C 1kJ (100°C) = (50kg 4.187 KJ x . 20935000 J
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