Final answer:
To find the mass percent concentration of a dextrose solution, divide the mass of dextrose by the total mass of the solution and multiply by 100%. For a solution containing 15.8 g of dextrose in 200 g of solution, the calculation gives a mass percent concentration of 7.9%.
Step-by-step explanation:
The mass percent concentration of a solution can be found using the following formula:
Percent by mass = (mass of solute / mass of solution) × 100%
For the solution with dextrose (C₆H₁₂O₆) having a total mass of 200 g and 15.8 g of dextrose dissolved:
Percent by mass = (15.8 g / 200 g) × 100% = 7.9%
Therefore, the mass/mass percent concentration of dextrose in the solution is 7.9%.