Question #863ff

1 Answer
Apr 5, 2016

Answer:

#"12.0 g NaCl"#

Explanation:

The problem provides you with the solution's percent concentration by mass, which essentially tells you how much solute you for every #"100 g"# of solution.

In this case, a #"12.0%# sodium chloride solution will contain #"12.0 g"# of sodium chloride, which is your solute, for every #"100. g"# of solution.

That is to say that you can make this solution by dissolving #"12.0 g"# of sodium chloride in #"88.0 g"# of water. The total mass of the solution will be

#m_"solution" = overbrace("12.0 g")^(color(red)("solute")) + overbrace("88.0 g")^(color(blue)("solvent")) = "100. g"#

Since the solution contains #"12.0 g"# of sodium chloride in #"100. g"# of water, its percent concentration by mass will be #12.0%#.