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Homework Help: Finding molar mass of unknown element

  1. Oct 5, 2008 #1
    1. The problem statement, all variables and given/known data
    element X reacts with oxygen to produce a pure sample of X2O3 . in an experiment, it is found that 1.0g of X produces 1.1596g of X2O3 . what is the molar mass of X?

    2. Relevant equations

    3. The attempt at a solution
    well we can write a equation for it 4X + 3O2 ---> 2X2O3
    from this we can see that 4 moles of X gives 2 moles of X2O3.
    so 4*x(x is molar mass of X)g of X gives 2x+96 g of X2O3
    where do we go from here?
  2. jcsd
  3. Oct 6, 2008 #2


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    Staff: Mentor

    You don't need reaction equation to solve the question. Can you calculate number of moles of metal knowing number of moles of oxygen? Can you calculate mass of oxygen from the numbers given?
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