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What is the fraction of the mass of water due to neutrons?

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Calculate the number of moles in $5.75 \, g$ of sodium (atomic mass of sodium $= 23$).

Calculate the mass of $20$ water molecules.

State the number of atoms present in each of the following chemical species:
$(a)$ $CO_{3}^{2-}$
$(b)$ $PO_{4}^{3-}$
$(c)$ $P_{2}O_{5}$
$(d)$ $CO$

How did Berzelius assign symbols to the elements?

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