CHEM HW PLZ HELP

Question

A silicon wafer with dimensions 14.00 cm × 14.00 cm × 0.0400 cm contains 0.650 moles of silicon. How many grams of Si does this represent? 

Answer 1

We are given the moles of silicon and asked to find the grams of silicon. The dimensions of the wafer are not relevant and aren't needed in this calculation.

atomic mass of silicon (Si) = 28.09 g / mol

0.650 mols x 28.09 g / mol = 18.3 g of silicon