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Posted by on Saturday, April 19, 2008 at 9:10am.

A runner weighs 560 N (about 130 lb), and 74% of this weight is water.

(a) How many moles of water are in the runner's body?
moles

(b) How many water molecules (H2O) are there?
molecules

  • Physics - , Saturday, April 19, 2008 at 7:41pm

    runner's mass = 560N/g = 560/9.8 kg
    weight of water =(560/9.8)*74% kg
    =(560/9.8)*.74*1000 g
    atomic mass of hydrogen=1g/mol
    atomic mass of oxygen=16g/mol, so
    atomic mass of water=2x1+16=18g/mol
    moles water=(560/9.8)*.74/18
    molecules=[moles water]*6x10^23

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