Calculate the amount of heat in BTUs required to change 5 pounds of 10°F ice to 242°F steam?
What will be an ideal response?
The heat required to increase the temperature of 5 pounds of ice from 10?F to
32?F is calculated using the specific heat formula:
BTUs = pounds x °F ?T x specific heat capacity in BTU per pound.
BTUs=5 lb x 22 x 0.5 = 55 BTUs
The heat required to melt 5 pounds of ice is calculated using the latent heat
formula:
BTU = weight x latent heat factor
BTU= 5 x 144 = 720 BTUs
The heat required to increase the temperature of 5 pounds of water from 32?F
to 212?F is calculated using the specific heat formula:
BTUs = pounds x °F ?T x specific heat capacity in BTU per pound.
BTUs=10 lb x 180 x 1 = 1800 BTUs
The heat required to boil 5 pounds of water is calculated using the latent heat
formula:
BTU = weight x latent heat factor BTU= 5 x 970 = 4850 BTUs
The heat required to increase the temperature of a pound of steam from 212?F to 242?F is calculated using the specific heat formula:
BTUs = pounds x °F ?T x specific heat capacity in BTU per pound. BTUs=5 lb x 30 x 0.5 = 75 BTUs
Finally, sum the results
55 BTUs + 720 BTUs + 1800 BTUs + 4850 BTUs + 75 BTUs = 7500 BTU
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