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3. Since the density of water is
ρ
= 1000 kg/m
3
= 1 kg/L, then the total mass of the pool is
ν
= 4.32
×
10
5
kg, where
ν
is the given volume. Now, the fraction of that mass made
up by the protons is 10/18 (by counting the protons versus total nucleons in a water
molecule). Consequently, if we ignore the effects of neutron decay (neutrons can beta
decay into protons) in the interest of making an orderofmagnitude calculation, then the
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 Fall '10
 Rebello,NobelS
 Mass

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