Answer:
30 grams
Step-by-step explanation:
To find the mass, you need to multiply the given volume by the denisty. You can use the denisty to convert between grams and milliliters because denisty represents the mass of the solution per every 1 mL. It is important to arrange the ratio in a way that allows for the cancellation of units (mL should be in the denominator to cancel the units to the given volume).
Density = 1.50 g/mL
20 mL 1.50 g
---------------- x ------------------- = 30 grams
1 mL