6.2 Calorimetry
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Calorimeters
q = CΔT C = heat capacity ΔT = Tf - Ti
If an object absorbs 1000J of heat and its temperature increases 5 degrees, what is its heat capacity?
Heating Curve
q = mcΔT m = mass c = specific heat ΔT = Tf - Ti
ΔH°fus = heat of fusion (melting)
ΔH°vap = heat of vaporization (boiling)
Calorimetry Problems
How much heat would be required to raise 90g of ice at -20°C to 30°C?
| Thermodyanmic Data for H2O | |
|---|---|
| c,ice | 2.03 J/g•ºC |
| c,liquid water | 4.18 J/g•ºC |
| c,ice | 2.01 J/g•ºC |
| ΔHºfus | 6.01kJ/mol |
| ΔHºvap | 40.65kJ/mol |