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One molecule of water (H2O) contains two atoms of hydrogen
and one atom of oxygen.A hydrogen atom has a mass of 1.0 u and an
atom of oxygen has a mass of 16 u, approximately. (a) What is the
mass in kilograms of one molecule of water? (b) How many molecules
of water are in the world’s oceans, which have an estimated total
mass of 1.4 * 10^21 kg?

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