chemistry

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From a laboratory process designed to separate water into hydrogen and oxygen gas, a student collected 10.2 g of hydrogen and 66.9 g of oxygen. How much water was originally involved in the process?

  • chemistry -

    Well, I suppose mass was conserved

    10.2 + 66.9 = 77.1
    ------------------------
    You can stop there.
    ------------------------

    Now let's check if they are in the right ratio

    2 H2O ---> 2 H2 + O2

    2 mols of H2 for every mol of O2

    mol of H2 has mass 2 g
    mol O2 has mass 32 g
    so it should be 4/32 = 1/8

    Well, it does not check :(

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