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Using Avogadro's Number

How many H2O molecules are there in a snowflake weighing 1 mg?

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Snowflakes are made of water, H2O. First, we need to find the mass of one mole (Avogadro's number or 6.022 x 10^23) of H2O molecules. To obtain this number, first look up the atomic masses for H and O ...