A chemist has 400 milliliters (mL) of solution that is 21% acid. How many milliliters of acid are in the solution?
0.21 * 400 = ?
84
To find the number of milliliters of acid in the solution, we need to calculate 21% of 400 mL.
Step 1: Convert the percentage to a decimal by dividing it by 100.
21% ÷ 100 = 0.21
Step 2: Multiply the decimal by the total volume of the solution.
0.21 × 400 mL = 84 mL
Therefore, there are 84 milliliters of acid in the solution.