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 orliquid water? Calculate ?S for the process. Is the processspontaneous?
The Chalk Point, Maryland, generating station supplies electricalpower to the Washington, D.C., area. Units 1 and 2 have a grossgenerating capacity of 710 megawatts (MW). The steam pressure is 25à 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 operatingunder these conditions?
b. If the efficiency of the boiler is 91.2%, the overall efficiencyof the turbine, which includes the Carnot efficiency and itsmechanical efficiency, is 46.7%, and the efficiency of thegenerator is 98.4%, what is the efficiency of the total generatingunit? (Another 5% needs to be subtracted for other plantlosses.)
c. One of the coal burning units produces 355 MW. How many metrictons (1 metric ton = 1 Ã 10^6 g) of coal per hour are required tooperate this unit at its peak output if the enthalpy of combustionof coal is 29.0 Ã 10^3 kJ kgâ1?
Thanks for the help!
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 orliquid water? Calculate ?S for the process. Is the processspontaneous?
The Chalk Point, Maryland, generating station supplies electricalpower to the Washington, D.C., area. Units 1 and 2 have a grossgenerating capacity of 710 megawatts (MW). The steam pressure is 25à 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 operatingunder these conditions?
b. If the efficiency of the boiler is 91.2%, the overall efficiencyof the turbine, which includes the Carnot efficiency and itsmechanical efficiency, is 46.7%, and the efficiency of thegenerator is 98.4%, what is the efficiency of the total generatingunit? (Another 5% needs to be subtracted for other plantlosses.)
c. One of the coal burning units produces 355 MW. How many metrictons (1 metric ton = 1 Ã 10^6 g) of coal per hour are required tooperate this unit at its peak output if the enthalpy of combustionof coal is 29.0 Ã 10^3 kJ kgâ1?
Thanks for the help!
