Density question

Question

The density of oil is 0.879 g/mL. How many grams of oil are needed to fill a 25.00 mL graduated cylinder?

Answer 1

The density is given in mass per unit volume (g/mL) in this case.

 

Let ρ = density (in g/mL)

Let V = volume (in mL)

Let m = mass (in g)

 

ρ = m/V

 

To find how much mass (how many grams) of oil is needed, solve for 'm'. Then substitute the values in for ρ and V. Make sure that the units cancel out put leave the mass in grams in the numerator..