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How many water molecules are on and in the earth?

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The total volume of all seas and oceans on the Earth is approximately 1.37*10^9 km^3 [1] .The density of seawater is on the average 1023.6 kg/m^3 [2] This means that the total mass of water in all oceans is 1.40*10^21 kg. The number of moles is then 7.8*10^22 mol. 1 mol contains 6. read more

(Most of our water becomes chemically destroyed before rebonding every 100 million years or so) Considering the fact that the dinosaurs lived about 65 million years ago, our estimates say that MORE than half of the molecules in our water (about 57%) were once ingested by the dinosaurs. read more

This is much less than the number of molecules in a glass of water. There's an Avogadro number ([math]6 \times 10^{23}[/math]) of water molecules in a mole of water, and a mole of water is just 18 grams, much less than a glassful (~250 grams). read more

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