Calculate the mass in grams of glycerol you would need to make 200 g of a 20% (w/w) glycerol solution.

To calculate the mass of glycerol needed to make a 20% glycerol solution, you can use the formula:

Mass of solute (glycerol) = Mass of solution (200 g) × Percentage of solute (20%)

First, convert the 20% (w/w) glycerol concentration into a decimal form by dividing it by 100:

20% ÷ 100 = 0.2

Next, substitute the given values into the formula:

Mass of solute (glycerol) = 200 g × 0.2

Finally, solve the equation:

Mass of solute (glycerol) = 40 g

Therefore, you would need 40 grams of glycerol to make a 200 g solution with a 20% (w/w) concentration.