What is the mass in grams of #"CaCl"_2"# in a #"3 M CaCl"_2"# solution?

1 Answer
Aug 24, 2017

Answer:

#"300 g CaCl"_2"#

Explanation:

#"Molarity"=("mol solute")/("liter of solution")#

A 3 M solution of calcium chloride contains 3 moles of the solute #"CaCl"_2# in one liter of solution. To convert 3 mol #"CaCl"_2# to mass in grams, multiply the given moles by the molar mass: #"110.978 g/mol"#.

#3color(red)cancel(color(black)("mol CaCl"_2))xx(110.978"g CaCl"_2)/(1color(red)cancel(color(black)("mol CaCl"_2)))="300 g CaCl"_2"# (rounded to one significant figure due to 3 mol)