6. Since the density of water is ρ = 1000 kg / m 3 =1k g / L, then the total mass of the pool is ρ V = 4 . 32 × 10 5 kg, where V 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
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