Chemistry

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What would be the steps to solving this problem?

The aluminum sulfate hydrate [Al2(SO4)3 (times) xH2O] contains 8.20 % Al by mass. Calculate x, that is , the number of water molecules associated with each Al2(SO4)3 unit.

  • Chemistry -

    RMM for Al2(SO4)3
    =27*2+(32+4*16)*3
    =342
    RMM for H2O
    =2+16
    =18
    Number of water molecules = n
    Thus
    27*2/(342+18n)=0.082
    Solve for n to get 18 (to 2 signinficant digits).

  • Chemistry -

    Thank You so much!
    I have some other questions that I don't understand.

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