Question

How many grams of silicon are in a computer chip with 1.08x10^23 atoms of Si ?

Answer 1

1) calculate number of moles of Si = 1.08x10^23 atoms / 6.02x10^23 atoms/mole = 0.18 mol Si
2) calculate grams of Si = number of moles x MW (Si) = 0.18 mole x 28.1 g/mole = 5.04 g Si