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    Find the modecular formula

    0.02moles of a substance has a mass of 0.94g abd this mass contains 0.80g if mercury, the rest being chlorine.

    The answer is Hg2Cl2.

    Why?
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    (Original post by superkillball)
    Find the modecular formula

    0.02moles of a substance has a mass of 0.94g abd this mass contains 0.80g if mercury, the rest being chlorine.

    The answer is Hg2Cl2.

    Why?
    Use the formula Moles = mass/Molecular Mass to find how many moles of each substance there is.....this finds the ratio 1:1 of the compounds...but this is empirical.

    Since the number of moles you've calculated for each substance should be 0.01 of each....but you are told there are 0.02 moles present, this means that the actual formula is Hg2Cl2...as opposed to HgCl

    Hope this helps

    G
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    (Original post by gzftan)
    Use the formula Moles = mass/Molecular Mass to find how many moles of each substance there is.....this finds the ratio 1:1 of the compounds...but this is empirical.

    Since the number of moles you've calculated for each substance should be 0.01 of each....but you are told there are 0.02 moles present, this means that the actual formula is Hg2Cl2...as opposed to HgCl

    Hope this helps

    G
    Why each substance should be 0.01 mole?
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    Because when u calculate the EF it comes out as 1:1
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    (Original post by jacie)
    Because when u calculate the EF it comes out as 1:1
    Why 1:1 should be 0.01 mole?
 
 
 
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