heating an ore of amitomy Sb2S3, in the presence of iron gives the element antimon;y and iron(II)sulfide HELP?

What‘s this asking for.A) how many moles os Fb2S3 are needed to react with an excess amount of iron to produce 9.4 mol of animony? WHAT DO I DO??? *freakout*B) how many mols Fe need to prod. 9.40 of antimony.C) calc. the number of moles Sb produced when 122 mol of FeS is produced.