Here's how to calculate the moles of platinum in 10.0 g:

1. Find the molar mass of platinum (Pt):

* Look up the atomic mass of platinum on the periodic table. It's approximately 195.08 g/mol.

2. Use the formula:

* moles = mass / molar mass

3. Plug in the values:

* moles = 10.0 g / 195.08 g/mol

* moles ≈ 0.0513 mol

Therefore, there are approximately 0.0513 moles of platinum in 10.0 g of the metal.