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Homework Help: Calculating Mass from Chemical Reaction

  1. Sep 28, 2013 #1
    1. The problem statement, all variables and given/known data
    what is the mass of alum that can be prepared from 1.340g of Al.

    2. Relevant equations
    2Al+2KOH+4H2SO4+22H2O ---> 3H2 + 2KAl(SO4)2 * 12H2O

    3. The attempt at a solution
    given Al is the limiting reagent. Find the moles of Al using n=m/M

    I find Al moles to be 0.049662mol.

    Now multiply this by the molar ratio of 2/2 (which is 1) to find the moles of alum produced.

    now calculate for the mass, m = nM. The molar mass of alum is 474.3g/mol. I find the mass of alum to be 23.55g.

    Am I right?
  2. jcsd
  3. Sep 29, 2013 #2


    User Avatar

    Staff: Mentor

    Looks OK to me.
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