Question: (a) What is the difference between adding a subscript 2 to the end of the formula for CO to give CO2 and adding a coefficient

(a) What is the difference between adding a subscript 2 to the end of the formula for CO to give CO2 and adding a coefficient in front of the formula to give 2 CO?
(b) Is the following chemical equation, as written, consistent with the law of conservation of mass?
3 Mg(OH)2(s) + 2 H3PO4(aq) → Mg3(PO4)2 (s) + 6 H2O(I)
Why or why not?

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