1.00 kJ of heat is added to a slug of silver and a separate 1.00 kJ of heat is added to a slug of iron. The heat capacity of the silver slug is 137J/°C while the heat capacity of the iron slug is 615 J/°C.
If the slugs are each originally at 25.00°C, what is the final temperature of each slug?
Explanation: To calculate heat, we can use the formula q=CΔT, where q is heat, C is heat capacity and ΔT = Tfinal - T initial.
Silver:
q=1.00kJ = 1000J (we had to convert kJ to J by multiplying by 1000) because heat capacity has units of joules
C silver = 137J/C
Tinital = 25.00°C
T final = ?
Let's plug everything into our formula:
q=CΔT
1000J = 137J/C (ΔT)
ΔT = 7.29927
ΔT = Tfinal - T initial.
7.29927 = Tfinal - 25.00°C
Tfinal = 32.299°C= 32.3°C
Iron:
q=1.00kJ = 1000J (we had to convert kJ to J by multiplying by 1000) because heat capacity has units of joules
C iron = 615 J/°C
Tinital = 25.00°C
T final = ?
Let's plug everything into our formula:
q=CΔT
1000J = 615 J/°C (ΔT)
ΔT = 1.626
ΔT = Tfinal - T initial.
1.626 = Tfinal - 25.00°C
Tfinal = 26.626°C= 26.6°C
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