AP CHEM
1. Which compound contains the highest percentage of magnesium by mass?
(A) MgNH4PO4
(B) Mg(H2PO4)2
(C) Mg2P4O7
(D) Mg3(PO4)2
6. Which of the following is a weak electrolyte in aqueous solution?
(A) HF
(B) NaF
(C) HCl
(D) KCl
4. What is the molarity of sodium ions in a solution prepared by diluting 250. mL of 0.550 M Na2SO4 to 1.25 L?
(A) 0.110 M
(B) 0.138 M
(C) 0.220 M
(D) 0.275 M
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