Calculate the number of moles of aluminum, sulfur, and oxygen atoms in 7.00 moles of aluminum sulfate, al2(so4)3. express the number of

We are given with 7 moles of a compound with a molecular formula of al2(so4)3 and is as asked here to determine the number of moles of Al, S and O. In a mole of aluminum sulfate, there are 2 moles of Al, 3 moles of S and 12 moles of O. Hence in total, there are 14 mol Al, 21 mol S, and 84 mol O. 

A.(nh4)(2co3)is the correct answer