How much heat is lost when a 640 g piece of copper cools from 375°C to 26°C?

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Answer 1 · 2017-05-07T18:34:30

#86486.4J# or #86.486kJ#

#E=mcdeltatheta#

#m#: mass (kg)
#deltatheta#: change in temperature #(°C)#
#c#: specific heat capacity - the energy needed to heat #1#kg of a substance by #1°C#.

specific heat capacity of copper #=385J#/#kg#/#°C#

the energy needed to heat #1#kg of copper by #1°C# is lost if #1#kg of copper cools by #1°C#.

therefore:

#E = mcdeltatheta#

# = 0.640kg * 385J#/#kg#/#°C * (375-26)°C#

# = 0.640kg * 385J#/#kg#/#°C * 351°C#

#86486.4J# or #86.486kJ#