
Lauren H. answered 03/28/19
Experienced High School Chemistry Teacher
2 K_3PO_4 (aq) + 3 MgCl_2 (aq) = Mg_3(PO_4)_2 (s) + 6 KCl (aq)
127 mL K3PO4 x (1L/1000mL) x (2.1 mol K3PO4/1 L K3PO4) x (1 mol Mg3(PO4)2/2 mol K3PO4) x (262.86 g Mg3(PO4)2/1 mol Mg3(PO4)2 = 35.05 g Mg3(PO4)2
check my math...