Final answer:
To calculate the density of the liquid, divide the mass (210 grams) by the volume (500 milliliters) to get a density of 0.42 g/mL.
Step-by-step explanation:
To calculate the density of a liquid, you can use the formula density = mass/volume. Given the mass of the liquid is 210 grams and the volume is 500 milliliters, you can convert the volume into liters since density is often expressed in grams per milliliter (g/mL) or kilograms per liter (kg/L). Thus, the volume in liters is 0.500 liters (as 1 mL = 0.001 L).
Applying the formula, we find that density = 210g / 500mL = 0.42 g/mL. Remember, the density unit is based on the mass and volume units used, so it's important to convert them to units that match the density units you want to use (g/mL in this case).