How many atoms are there in 5.10 grams of sulfur?

You will need to convert to moles, and then atoms. Here is the equation:

(5.10 grams over one) times (1 mol S over 32.06 g S) times (6.022 X 10 23 atoms over 1 mol S)

the last part of the equation is read six point zero two two times ten to the twenty third.