Final answer:
The mass percent of a solution with 51.66 g of NaCl in 168.6 g of H2O is calculated by adding the mass of solute and solvent to find the total solution mass, then dividing the mass of solute by the total mass, and multiplying by 100. The mass percent concentration of the solution is 23.45%.
Step-by-step explanation:
To calculate the mass percent (m/m) of a solution prepared by dissolving 51.66 g of NaCl in 168.6 g of H₂O, you can use the mass percent formula:
Mass Percent = (Mass of Solute / Mass of Solution) × 100%
Firstly, determine the mass of the solution:
Mass of NaCl (solute) = 51.66 g
Mass of H₂O (solvent) = 168.6 g
Total Mass of Solution = Mass of solute + Mass of solvent
Total Mass of Solution = 51.66 g + 168.6 g
Total Mass of Solution = 220.26 g
Next, plug these values into the formula:
Mass Percent NaCl = (51.66 g / 220.26 g) × 100%
Calculate the mass percent:
Mass Percent NaCl = (0.2345) × 100%
Mass Percent NaCl = 23.45%
The mass/mass percent concentration of the solution is 23.45%.