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    Using Avogadro's Number

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    Calculate the mass in grams of 2.5 x 10^9 H2O molecules.

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    https://brainmass.com/chemistry/stoichiometry/using-avogadro-s-number-41172

    Solution Preview

    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 ...

    $2.49

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