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

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

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