A solution is made by dissolving 3.60g of sodium chloride to a final volume of 115mL solution. What is the weight/volume percent of the solute?
A solution's weight by volume percent concentration,
This implies that in order to determine a solution's weight by volume percent concentration, all you have to do is to figure out the number of grams of solute you get for every
In your case, you know that you have
As you know, solutions are homogeneous mixtures, which implies that they have the same composition throughout. This allows you to use the known composition as a conversion factor to scale the mass of the solute to a volume of
In other words, you will have
#100 color(red)(cancel(color(black)("mL solution"))) * overbrace("3.60 g NaCl"/(115color(red)(cancel(color(black)("mL solution")))))^(color(blue)("known composition")) = "3.13 g NaCl"#
Since this represents the mass of solute present in
#color(darkgreen)(ul(color(black)("% w/v = 3.13% NaCl")))#
The answer is rounded to three sig figs.