Which is the balanced equation for cap v sub 2 cap o sub 5 plus CaS rightarrow CaO plus cap v sub 2 cap s sub 5 ?

Start with 1 V₂O₅ and 1 V₂S₅ to balance vanadium. V₂O₅ contains 5 oxygen atoms, so place 5 before CaO. That requires 5 calcium atoms, so place 5 before CaS; those 5 CaS also provide the 5 sulfur atoms needed for V₂S₅. The balanced equation is V₂O₅ + 5 CaS → 5 CaO + V₂S₅, choice B.

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