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How many kilograms of water at 15oC can be heated
to 95oC by burning 143 grams of methane, CH4, assuming
that 100% of the heat is used to heat the water.
The heat of combustion of methane is 891 kJ per mole
of methane. (The specific heat of water is 4.184 J/goC.)

I am not sure what to do

  • Chemistry -

    Heat obtained from CH4 = 891 kJ x 143/16 = ? kJ.
    ?kJ = mass H2O x specific heat H2O x (Tfinal-Tinitial)
    Solve for mass H2O and convert to kg.

  • Chemistry -

    molar mass is 16 for CH4
    and answer is 23.8 kg

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