Question

Calculate the mass percent for a solution containing 85g NaCl and 155g water.​

Answer 1

The mass percent for a solution : 35.42%

Further explanation

The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.

$\tt \%mass=\dfrac{mass~solute}{mass~solution}\times 100\%$

mass solute = 85 g

mass solution = 85 + 155 = 240 g

$\tt \%mass=\dfrac{85}{240}\times 100\%=35.42\%$