A 25.0-g mass of ice at 273 K is added to 150.0 g of H2O(l) at 360. K at constan

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A 25.0-g mass of ice at 273 K is added to 150.0 g of H2O(l) at 360. K at constant pressure. Is the final state of the system ice or liquid water? Calculate ?S for the process. Is the process spontaneous?

The Chalk Point, Maryland, generating station supplies electrical power to the Washington, D.C., area. Units 1 and 2 have a gross generating capacity of 710 megawatts (MW). The steam pressure is 25 × 10^6 Pa, and the superheater outlet temperature (Th) is 540°C. The condensate temperature (Tc) is 30.0°C.
a. What is the efficiency of a reversible Carnot engine operating under these conditions?
b. If the efficiency of the boiler is 91.2%, the overall efficiency of the turbine, which includes the Carnot efficiency and its mechanical efficiency, is 46.7%, and the efficiency of the generator is 98.4%, what is the efficiency of the total generating unit? (Another 5% needs to be subtracted for other plant losses.)
c. One of the coal burning units produces 355 MW. How many metric tons (1 metric ton = 1 × 10^6 g) of coal per hour are required to operate this unit at its peak output if the enthalpy of combustion of coal is 29.0 × 10^3 kJ kg–1?

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