• Question: how many hydrogen atoms are in 17.34 cubic cm of water

    Asked by joshgladwin to Andrew, Bruce, Lindy, Lizzie on 20 Jun 2012.
    • Photo: Bruce Alexander

      Bruce Alexander answered on 20 Jun 2012:


      As a rough estimate, 1,160,000,000,000,000,000,000,000 atoms of hydrogen, but I wouldn’t want to count them! The concentration of water is 55.55 moles per litre, there are 0.96 moles of water in 17.34 cm3 and therefore 1.926 moles of hydrogen. To get the number of hydrogen atoms, you have to multiply this by Avogadro’s number.

      Is this your homework done?

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