Question

Which has more atoms: 3.0 g of iron, or 2.0 g of sulfur?

Answer 1

You must calculate the molar quantity of each element. Moles relate to the number of species. If there are 1 mole of particles, there are `6.022xx10^23` individual particles.

Explanation:

Moles of iron, `(3.0*cancelg)/(55.85*cancel(g)*mol^-1)` `=` `??mol`

Moles of sulfur, `(2.0*cancelg)/(32.06*cancel(g)*mol^-1)` `=` `??mol`

I leave it to you to do these calculation and get an answer in moles. It looks pretty clear that there are more sulfur atoms.