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\( \mathbf{2} \boldsymbol{C} \boldsymbol{a}_{3}\left(\boldsymbol{P} \boldsymbol{O}_{4}\right)_{2}+\boldsymbol{6} \boldsymbol{S} \boldsymbol{i} \boldsymbol{O}_{2}+\mathbf{1 0} \boldsymbol{C} \rightarrow \boldsymbol{P}_{4}+ \) \( \boldsymbol{C a} \boldsymbol{S i O}_{3}+\mathbf{1 0 C O} \) Which coefficient balances the reaction given above?

1. 2
2. 4
3. 5
4. 6

Correct answer: 2

Solution

The equation is balanced by matching each element’s atom count on both sides. With 2 Ca3(PO4)2, there are 4 P atoms and 6 Ca atoms, so the product must be 1 P4 and 6 CaSiO3, which also fits the oxygen and carbon counts already shown.

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