Aqueous potassium phosphate was mixed with aqueous magnesium chloride, and a crystallized magnesium phosphate product was formed. Consider the other product and its phase, and then write the balanced molecular equation for this precipitation reaction

Answer 1

What's the problem here? One product is given; the other is what's left over.
K3PO4(aq) + MgCl2(aq) ==> Mg3(PO4)2(s) + KCl(aq)
This is a double replacement reaction. Can you balance it from here?

Answer 2

What is the molecular equation for potassium phosphate mixed with magnesium chloride

Answer 3

K3PO4(aq) + MgCl2(aq) ==> Mg3(PO4)2(s) + KCl(aq)