I dont have many questions left to post so please try to answer all of them it is urgent thank you!!

Aluminum pulfate, Al2(SO4)3, is used in some antiperspirants. How many moles of O are present in 3.3mol of Al2(SO4)3 ? Express the number of moles to two significant figures. Calculate the number of CO2 molecules (NCO2) in 0.0231mol of CO2. Express your answer using three significant figures. Calculate the number of moles of Cu(nCu) in 5.91021 atoms of Cu. Express your answer using two significant figures. Calculate the number of moles of C2H6(nC2H6) in 7.821023 molecules of C2H6. Express your answer using three significant figures