Taking into account the definition of density, the density of the oil is 0.8 [tex]\frac{g}{mL}[/tex].
But first you must know the definition of density. Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
In this case, you know that an empty 250 mL beaker has a mass of 60 grams. When 100 mL of oil is added to the beaker, the total mass is 140 grams. This means that the mass of the oil will be
mass oil= 140 grams - 60 grams
mass oil= 80 grams
You're adding 100 mL of oil to the beaker. So, if 100 mL of oil have a mass of 80 g, the density can be calculated as:
[tex]density=\frac{80 g}{100 mL}[/tex]
density= 0.8 [tex]\frac{g}{mL}[/tex]
In summary, the density of the oil is 0.8 [tex]\frac{g}{mL}[/tex].
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