what is the mass percent of a solution made by dissolving 35.5 g. of NaCl in 500 g. of water?

% w/w = (mass solute/mass solution)*100 = ?

mass solute = 35.5 g
mass solution = 500 + 35.5 = ?

To find the mass percent of a solution, you need to divide the mass of the solute (NaCl) by the mass of the solution (NaCl + water), and then multiply by 100.

In this case, the mass of NaCl is given as 35.5 g and the mass of water is given as 500 g. Therefore, the total mass of the solution is 35.5 g + 500 g = 535.5 g.

To calculate the mass percent, divide the mass of NaCl by the total mass of the solution, and then multiply by 100:

Mass Percent = (Mass of NaCl / Total Mass of Solution) * 100

Substituting the given values:

Mass Percent = (35.5 g / 535.5 g) * 100

Now we can calculate it using the given values:

Mass Percent = 6.64%

So, the mass percent of the solution made by dissolving 35.5 g of NaCl in 500 g of water is approximately 6.64%.