First Law of Thermodynamics
22. The First Law of Thermodynamics / First Law of Thermodynamics / Problem 1
A car radiator is filled with pure water. The radiator cap keeps the pressure at 3.5 atm and pushes the boiling point of water to 140°C. At 3.5 atm, the heat of vaporization is 2.11 × 106 J/kg. What would be the increase in the internal energy (ΔU) of water if 250 g of the steam were formed from water at this temperature and pressure? At 3.5 atm and 140 °C, the densities of water and steam are 928.5 kg/m3 and 1.93 kg/m3, respectively.
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