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18 May, 11:11

Aluminum sulfate is analyzed, and the sample contains 0.0670 moles of sulfate ions. How many moles of aluminum are in the sample?

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  1. 18 May, 15:01
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    0.0447 moles of Aluminum

    Explanation:

    Break this down to an ionic equation (which may not exist in the real world but it will give you the mol ratios).

    Al2 (SO4) 3 = ==> 2Al^ (+3) + 3 SO4^ (-2)

    Now write the equation showing the actual number of moles of SO4^ (-2) present. Indicate the Al moles with an x

    Al2 (SO4) 3 = ==> 2Al^ (+3) + 3 SO4^ (-2)

    x 0.0670

    Now set up a proportion

    2/x = 3/0.0670 Cross multiply

    2*0.0670 = 3x Simplify the left

    0.134 = 3x Divide both sides by 3

    0.134/3 = 3x/3 Divide

    0.0447 = x

    there are 0.0447 moles of Aluminum
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