Final answer:
To measure exactly 100 g of sugar and add it to the solution, use a balance or scale to measure the mass of the sugar. Place an empty container on the balance, set it to zero, then add sugar until the mass reads 100 g.
Step-by-step explanation:
To measure exactly 100 g of sugar and add it to the solution, you would use a balance or scale to measure the mass of the sugar. Start by placing an empty container, such as a weighing boat or a beaker, on the balance or scale. Then, set the balance or scale to zero to account for the weight of the container. Next, slowly add sugar to the container until the balance or scale displays a mass of 100 g. Make sure to check and record the mass to ensure accuracy.