Answer
2.5%
Step-by-step explanation
The percentage by mass of a solution can be calculated by dividing the mass of the solute by the mass of the solvent, then, multiplied by 100.
According to this question, 25 grams of dextrose is dissolved in 1000 grams of solution. The percent concentration is calculated as follows:
Therefore, If there are 25 grams of dextrose dissolved in 1000 g of solution, the percent concentration is 2.5%