Posted by James on Saturday, April 19, 2008 at 1:19pm.
The runner weighs 560 N so his mass id 560/9.8 = 57.1 kg
so
.74 * 57.1 = 42.3 kg water
a mol of H2O = 2 grams + 16 grams = 18 grams = 18 * 10^-3 kg/mol
so moles of water = 42.3 kg / (18*10^-3 kg/mol) = 2.35 *10^3 moles
there are 6*10^23 molecules/mol of anything
so number of molecules = 2.35 * 10^3 *6*10^23
= 14.1*10^26 = 1.41 *10^27 molecules
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