Calculate the percent mass of a solution made by dissolving 25.2 of KBr into .250 liters of water.
100
Two problems. You don't give a unit for 25.2 WHAT KBr. And you don't give the density.
If that is 25.2 GRAMS, then
% by mass = 25.2 g KBr/100 g solution.
If the density of the solution is 1.00 g/mL, then volume is 9.250 L and that has a mass of 250 grams so
(25.2/250)*100 = ??
To calculate the percent mass of a solution, we need to know the mass of the solute and the total mass of the solution.
In this case, the solute is KBr (potassium bromide) with a mass of 25.2 grams. The total volume of the solution is 0.250 liters of water, which we assume has a density of 1 g/mL since the density of water is close to 1 g/mL.
To find the total mass of the solution, we need to calculate the mass of the water. Since the density is 1 g/mL, 0.250 liters of water will have a mass of 0.250 kilograms or 250 grams.
Now, we can calculate the percent mass by dividing the mass of the solute by the total mass of the solution and multiplying the result by 100:
Percent mass of KBr = (mass of KBr / total mass of solution) * 100
Percent mass of KBr = (25.2 grams / (25.2 grams + 250 grams)) * 100
Percent mass of KBr = (25.2 grams / 275.2 grams) * 100
Percent mass of KBr = 9.16%
Therefore, the percent mass of the KBr solution is 9.16%.