how many of moles of oxygen atoms are in .02 moles of aluminum sulfate

3 answers

is this for connexus?
aluminum sulfate is Al2(SO4)3
so the ratio of O to Al is 12/2 = 6:1
so .02 moles of Al2(SO4)3 means 0.02*6 = 0.12 moles of oxygen atoms
oops! 0.02 moles Al2(SO4)3 x (12 mols O atoms/1 mol Al2(SO4)3 molecules) = 0.24 moles O atoms.