Question

How many moles in 53g of palladium 216g of silver 46g of tungsten

Answer 1

To answer this, all you have to do is take the mass of the sample, in grams, and divide it by the atomic/molecular mass of the substance, in amu (atomic mass units)
So, here are my answers:
(i) 53g of Palladium = 53/106 = 0.5 moles
(ii) 216g of Silver = 216/108 = 2 moles
(iii) 46g of Tungsten = 46/184 = 0.25 moles

Hope I helped!! xx

Answer 2

Moles = Mass / Mr 
You basically need to open the periodic table and divide the mass to find out the moles. 

Palladium = 53/ 106
                 = 0.5 moles

Silver = 216/108
          = 2 moles

Tungsten = 46/ 184
                = 0.25 moles