Chem 1710 Math Problems on Matter and Kinetic Theory

 

  • Energy and Matter

    For water, the following are the heat constants: Cp(solid) = 2.06 J/gC° , Cp(liquid) = 4.18 J/gC° , Cp(gas) = 2.03 J/gC° , Hf = 333 J/g, Hv = 2260 J/g

    Sample

    How much heat is needed to change 50.0 g of ice at 0.0° C to steam at 100.0° ?

     

     

     

     

    1. How much heat (in Joules) is required to raise the temperature of 787 g of water from 18.0° C to 100.0° C? (2.70 x 105 J) How much in units of calories? (2.70 x 105 J) (6.46 x 104 cal)

     

     

     

     

     

     

    2. How much heat is required to raise the temperature of 50.0 g of water at -25° (ice) to steam at 125° C? (1.56 x 105 J)

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