Lars is balancing equations with his study group. He is unsure about one equation because each member of the study group came up with a different answer. Which is the proper way to balance the equation Ca OH sub 2 plus cap h sub 3 PO sub 4 rightarrow Ca sub 3 open paren PO sub 4 close paren sub 2 plus cap h sub 2 cap o ?

The product contains 3 calcium atoms and 2 phosphate groups, so place coefficients 3 before Ca(OH)₂ and 2 before H₃PO₄. The reactants then have 12 hydrogen atoms, which requires 6 H₂O molecules; the oxygen atoms also balance (14 on each side). Thus, the balanced equation is choice C.

AI-written and checked against the verified answer.