Question #4f6f6

1 Answer
Dec 5, 2017

Answer:

#"1.65 g"#

Explanation:

The first thing that you can calculate here is the number of moles of calcium chloride dissolved to make your solution.

As you know, the molarity of the solution tells you the number of moles of solute present in every #"1 L" = 10^3# #"mL"# of the solution.

In your case, a #"0.550-M"# solution will contain #0.550# moles of calcium chloride, the solute, in every #10^3# #"mL"#. This means that your sample will contain

#27.0 color(red)(cancel(color(black)("mL solution"))) * "0.500 moles CaCl"_2/(10^3color(red)(cancel(color(black)("mL solution")))) = "0.01485 moles CaCl"_2#

To convert the number of moles to grams, you need to use the molar mass of the solute.

#0.01485 color(red)(cancel(color(black)("moles CaCl"_2))) * "110.98 g"/(1color(red)(cancel(color(black)("mole CaCl"_2)))) = color(darkgreen)(ul(color(black)("1.65 g")))#

The answer is rounded to three sig figs.