Using the relative atomic weights of both copper and sulfur ie copper = 63.55 and sulfur is 32.06 so 63.55+32.06=95.56 total mass and so of this, copper = 63.55/95.56=66.4%. So to get 10 grams of copper, use the formula 10g=66.4%xCuS so CuS=10/0.664=15.06 grams of CuS.
Strong internolecurar forces (A) hope it helps
It’s d like 100000000% trust me
173.1f is the answer I believe, please let me know if I'm wrong then I would try to make up for it