What Is The Number Of Molecules Of MgO Produced When .20 Mole Of O2 Reacts Completely?

2Mg + O2  = 2MgO
1 mol of O2 produces 2 mol of MgO ..
0.2 mol of O2 produces ? Mol of MgO ..
 
no of mole of MgO = 0.2/1 X 2
   =0.4 mol
no of molecule of MgO = no of mole X NA
  = 0.4 X 6.02 X 1023
  =2.408 X 1023 molecules