Report your answer to 3 significant figures in scientific notation (example: 1.23E+4) unless stated otherwise. DO NOT in

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Report your answer to 3 significant figures in
scientific notation (example: 1.23E+4) unless stated otherwise. DO
NOT include the units in your answer.

1. An aqueous solution of copper(II) chloride is prepared by
dissolving 5.21 g of copper(II) chloride in
1.77×102 mL of water. Assume that the addition of
the solid does not affect the volume of the solution.

INSTRUCTIONS: For each, report your
answer to 3 significant figures in scientific notation unless
stated otherwise. DO NOT include the units in your answer.

(a) What is the molarity of copper(II) chloride in this solution
(in mol/L)? mol/L
(b) What is the mass percent of copper(II) chloride in this
solution? %
(c) What is the mole fraction of copper(II) chloride in this
solution?
2. Consider a reaction of 606 mL of a 2.97×10-2 M
Na3PO4 solution completely reacts with
651 mL of a 8.08×10-2 M
SrCl2 solution according to the
following UNBALANCED chemical
equation.



Na3PO4(aq) + SrCl2(aq) →
Sr3(PO4)2(s) + NaCl(aq)



(a) Balance the chemical equation using the lowest
integer coefficients. Be sure to include all coefficients including
those of 1.

Na3PO4(aq)
+ SrCl2(aq)
→ Sr3(PO4)2(s)
+ NaCl(aq)
(b) Determine the mass (in g) of
Sr3(PO4)2 that is formed in
the reaction. Report your answer to 3 significant
figures in standard notation (example: 1.23).

g
(c) If 2.97×10-1 g of
Sr3(PO4)2 is produced, what
is the percent yield of the reaction? Report your
answer to 3 significant figures in standard notation (example:
1.23).

%
3. (a) How many moles of Ca2+ ions are present in
3.36×102 mL of a 3.87×10-3 M
solution of Ca(ClO4)2?

mol
(b) What volume of a 9.93×10-1 M solution of
Ca(NO2)2 (in L) contains
1.40×10-1 moles of
NO2− ion?

L
(c) Calculate the molarity (in mol/L) of Cl− ions
present in an aqueous solution prepared by adding 29.5 mL of
4.20×10-1 M aqueous CuCl2 to 263 mL
of water.

mol/L