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