[yazz]

my question is : when 2.435g of antimony is heated with excess sulfur, a chemical reaction occurs. the excess sulfur is driven off, leaving only the compound. if 3.397 g of compound are produced, what is the empirical formula of the compond?

my solution, i think you need to calculate the molar mass of antimony and then find the moles. for both the compound  and antimony the do the mole ratio and calculate the empirical formula. not so sure.
Can someone please reply and answer my question really important and urgent.

[allanf]

Since all the antimony stays put you could just take the final mass and subtract the initial mass to get the mass of sulfur in the final compound.  Converting the mass of antimony and mass of sulfur into moles readily gives the empirical formula