Water enters a boiler at 68 degrees Fahrenheit ['F] The boiler operates for 5 minutes [min] to heat 25 gallons [gal] of water using 5000 British Thermal Units [BTU] of energy. The specific heat capacity of water is 4.180 kilojoules per kilogram kelvin kJ kg K What is the final temperature in degrees Fahrenheit ['F] of the water as it exits the boiler?

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Helmholtz Free Energy

The Helmholtz free energy is a thermodynamic potential used to calculate the measure of useful work from a closed system. This system is kept at constant temperature and volume. German physicist Hermann Helmholtz introduced this concept in 1882.