Answer:
0.10 % w/w
Explanation:
The percent by mass (%w/w) is defined as one hundred times the ratio between the mass of solute (In this case aspirin, 0.05g) and the mass of solution (Mass solute + mass of water = 0.05g + 50g = 50.05g). The percent by mass is:
0.05g Aspirin / 50.05g * 100 =
0.10 % w/w
