Which metal has more moles

50 grams of platinum or 50 grams of gold?

convert both of them to moles by using the molar mass of the two:

Molar mass of platinum = 195.08 grams/mole

50 grams x 1 mole/195.08 grams = 0.256305 moles of platinum

Molar mass of Gold = 196.97 grams/mole

50 grams x 1 mole/196.97grams = 0.253845 moles of Gold

therefore: Platinum has more moles

mass / molar mass Pt = moles Pt

mass / molar mass Au = moles Au
Pt by very little but still more. Au has a greater molar mass than Pt

platinum has more moles because it has a lower molecular mass