Which equation best represents the balanced net ionic equation for the reaction

Question

Which equation best represents the balanced net ionic equation for the reaction that occurs when aqueous solutions of lithium phosphate and magnesium nitrate are mixed? a. 3Mg^2+ (aq) + 2PO_4^3- (aq) Mg_3 (PO_4)_2(s) b. Li_3PO_4 (aq) + 3Mg(NO_3)_2(aq) Mg_3(PO_4)_2(s) + 6LiNO_3(aq) c. 3Mg^2+ (aq) 2 PO_4^3-(aq) Mg_3(PO_4)_2(aq) d. 2Li^+ (aq) + Mg(NO_3)_2(aq) 2LinO_3(aq) + Mg^2+ (aq) e. 2 Li_3PO_4(aq) + 3 Mg^2+ (aq) Mg_3(PO_4)_2(s) + (Li^+)_6 (aq) The compound P_4S_3 is used in matches. It reacts with oxygen to produce P_4O_10 and SO_2. The unbalanced chemical equation is shown below. P_4S_3(s) + O_2(g) + P_4O_10(s) + SO_2(g) What mass of SO_2 is produced from the combustion of 0.401 g P_4S_3? a.0.134 g b. 1.20g c.0.0389g d.0.117g e.0.350g The commercial production of phosphoric acid, H_3PO_4, can be represented by the equation 1500g 300 g 304 g 1150 g 300 g Ca_3(PO_4)_2 + 3SiO_2 + 5C + 5O_2 + 3H_2O 3CaSiO_3 + 5CO_2 + 2H_3PO_4 310g/mol 60.1 g/mol 12.0 g/mol 32.0 g/mol 18. 0 g/mol The molar mass for each reactant is shown below the reactant, and the mass of each reactant for this problem is given above. Which substance is the limiting reactant?

Explanation / Answer

Q14

balanced net ionic equations when Lithium phosphate + magnesium nitrate react

so

Lithium phosphate = Li3PO4

Magnesium nitrate = Mg(NO3)2

in solution:

3Li+(aq) + PO4-3(aq) and Mg+2 + NO3-(aq)

note that Li and NO3- remain in solution, since those are pretty soluble and will not form precipitates

so

Mg+2 and PO4-3 will react to form precipitate

therefore

Mg3(PO4)2(s) is formed

net ionic must contain Mg+2 and PO4-3 as well

3Mg+2(aq) + 2PO4-3(aq) --> Mg3(PO4)2(s)

best answer is A

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