A solution is made by dissolving 7.084 g of aluminum nitrate, Al(NO3)3, in 123.0 g of water. What is the mass percentage of solute in this solution?
this feels like a simple problem but i just don't know. divide the two?
mass % = [(mass solute)/mass solution)]*100 = ?
mass solute = 7.084g
mass solution = 7.084g + 123.0g = ?
thank you
To find the mass percentage of solute in a solution, you need to divide the mass of the solute by the total mass of the solution (solute + solvent) and then multiply by 100. In this case, the solute is aluminum nitrate (Al(NO3)3) and the solvent is water.
First, calculate the total mass of the solution by adding the mass of the solute and the mass of the solvent:
Total mass of solution = mass of solute + mass of solvent
Mass of solute = 7.084 g
Mass of solvent = 123.0 g
Total mass of solution = 7.084 g + 123.0 g
Next, divide the mass of the solute by the total mass of the solution:
Mass percentage = (mass of solute ÷ total mass of solution) × 100
Mass percentage = (7.084 g ÷ (7.084 g + 123.0 g)) × 100
Simplify the denominator:
Mass percentage = (7.084 g ÷ 130.084 g) × 100
Divide the numbers:
Mass percentage ≈ 0.0545 × 100
Multiply and round the answer:
Mass percentage ≈ 5.45%
Therefore, the mass percentage of the solute (aluminum nitrate) in this solution is approximately 5.45%.