What amount of natural gas must be burned in order for m1=4.0 kg of ice, taken at t1=-20°C, to be converted into steam with a temperature t2=100°C. Heater efficiency k=60%. Specific heat of combustion of gas q=3.4•107 J/kg, specific heat of vaporization for water r=2.3•106 J/kg; specific heat capacity of ice c1=2.1•103 J/(kg•K); specific heat capacity of water c2=4.2•103 J(kgK); specific heat of melting of ice l=3.3•105 J/kg.
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