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    • Thread Starter

    Hi, really struggling at the moment, this is an AS level chemistry question on a sheet i have been given. Can anyone give me any advice on this please?

    "Tin ore, known as cassiterite, contains an oxide of tin. This oxide contains 78.8% tin by mass. Calculate the empirical formula of this oxide. You must show your working"


    So if tin makes up 78.8% of the mass, oxygen must make up the remaining 21.2%.

    Divide each percentage by the relative atomic mass, this will give you a ratio of elements in the compound. Find a way to convert these numbers to whole numbers :yes:

    And adding to post #2
    If the numbers are relatively near to a whole number then you should just round it

    Unless it's near to half, then double the numbers and you should get the answer too
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