How many oxygen atoms are contained in 2.74 g of al2(so4)3?

How many oxygen atoms are contained in 2.74 g of Al2(SO4)3? The answer is 5.79×1022. I need steps to figure out why though. I use Avagrados number, but am getting the wrong answer.

Answer

m ass of Al2 (SO)32.74g molar mass of Al2 (SO,)3-342.15g/mol No of O atoms 2.74g x 1 molAl (SO) 12 mol O -23x5 342.15g lmol A

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