Question

calculate the numbers of mole in 52.0 gram helium

Answer 1

formula for taking out no of moles is
no of moles = given weight / gram atomic weight
so
no of moles =52/4
13

Answer 2

No . of Moles = Mass in gm
                      Molar mass
                     
                    = 52  
                        4 
 
                   = 13 moles