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

heating curve

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