Question

A volumetric flask has a volume of 250 ml and weighs 100 g. If it weighs 277 g when filled with pure ether, what is the density of the ether?

a) 0.8 g/ml
b) 1.2 g/ml
c) 1.5 g/ml
d) 2.0 g/ml

Answer 1

The density of the ether is found by subtracting the mass of the empty flask from the mass of the filled flask and dividing by the volume of the flask. It comes out to be approximately 0.708 g/mL, which is closest to option (a) 0.8 g/mL.

Step-by-step explanation:

To calculate the density of the ether, we first need to find the mass of the ether alone, excluding the flask. To do this, we subtract the mass of the empty flask from the combined mass of the flask and ether. So the mass of the ether is 277 g (total mass) - 100 g (flask mass) = 177 g.

The volume of the ether is the same as the volume of the flask, which is 250 mL. Density is defined as mass per unit volume. Hence, the density (d) of ether can be found using the formula d = mass / volume.

Substituting the values into the formula, we get:
d = 177 g / 250 mL

Therefore, the density of ether is 0.708 g/mL, which after rounding could be approximately considered as 0.71 g/mL. This option, however, is not provided in the multiple choices given by the student, possibly due to rounding instructions not provided or a typo in the options. The closest provided option is (a) 0.8 g/mL, assuming the student is expected to round the calculated density.