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:
I believe that answer is D The heat from the Bunsen burner transfers to the water and the pot, then the heat from the pot transfers to the person’s hand.