5.2 Calorimetry
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Calorimeter
q = CcalΔT Ccal = heat capacity ΔT = Tf - Ti
If 3000.0J of heat causes a temperature increase of 3.0°C for a calorimeter, what is its heat capacity?
If 8g of methane (CH4) is combusted in a calorimeter with a heat capacity of 29.7kJ/°C and its temperature rises from 25.0°C to 40.0°C, what is the enthalpy of combustion of methane (in kJ/mol)?
Specific Heat
q = mCsΔT m = mass Cs = specific heat ΔT = Tf - Ti
How much heat would be required to raise 90g of ice at -20°C to 50°C?
| THERMODYNAMIC QUANTITIES FOR WATER | Cs,ice | 2.09 J/g•°C |
|---|---|
| Cs,liquid water | 4.18 J/g•°C |
| Cs,steam | 2.03 J/g•°C |
| ΔH°fus | 6.01kJ/mol |
| ΔH°vap | 40.65kJ/mol |