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Question
Calculate the number of kJ of heat necessary to raise the temperature of 60.0 g of aluminium from 35°C to 55°C. Molar heat capacity of Al is 24 J mol-1 K-1.
Numerical
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Solution
From the expression of heat (q),
q = m. c. ΔT
Where,
c = molar heat capacity
m = mass of the substance
ΔT = change in temperature
Substituting the values in the expression of q:
`"q" = (60/27 " mol")(24 "J mol"^(-1) " K"^(-1))(20" K")`
q = 1066.7 J
q = 1.07 kJ
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Thermodynamics Applications - Enthalpy, H - Extensive and Intensive Properties
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