How do you calculate the number of molecules?

Calculate each of the following: number of SO2 molecules in 1.33 moles SO2?

• moles of Fe in 5.18×10^22 atoms Fe moles of C2HeOH in 8.10×10^24 molecules C2H5OH Thanks for your help

• Answer:

  Hi Chemlost1, 1/ Number of SO2 molecules in 1.33 moles SO2 ? - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Avogadro's number NA = 6,02•10^23 mol^-1 N(SO2) = Na x n(SO2) N(SO2) = 6,02•10^23 x 1,33 N(SO2) = 8,00•10^23 molecules of SO2 2/ moles of Fe in 5.18×10^22 atoms Fe ? - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - n(Fe) = N(Fe) / NA n(Fe) = 5,18•10^22 / 6,02•10^23 n(Fe) = 8,60•10^-2 mol of Fe 3/ moles of C2H5OH in 8.10×10^24 molecules C2H5OH ? - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - n(C2H5OH) = N(C2H5OH ) / NA n(C2H5OH) = 8,10•10^24 / 6,02•10^23 n(C2H5OH ) = 13,46 mol of C2H5OH