How much heat is given off when 10 grams of water are cooled from 50°C to 40°C?
Convert 10 grams to pounds:
Convert 50 degrees C to Fahrenheit:
Convert 40 degrees C to Fahrenheit:
Calculate the change in temperature:
Heat lost in British Thermal Units (BTU):
The process will give off 420 J of heat.
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In your problem,
The negative sign tells you that energy is being given off.