Question

The density of ethyl alcohol (200 proof, or pure alcohol) is 0.789 g/ml at 20°c. calculate the mass of a 27.1 ml sample. enter your answer in the provided box.

Answer 1

Mass = density x volume so mass = 0.789 x 27.1 = 21.38 g

Answer 2

Answer:

21.4 grams

Explanation:

Given data

• Density of ethyl alcohol (200 proof, or pure alcohol): 0.789 g/mL

• Volume of the sample: 27.1 mL

• Mass of the sample: ?

The density (ρ) is equal to the quotient between the mass (m) and the volume (V).

ρ = m/V

We can use this expression to find the mass of the sample.

m = ρ × V

m = 0.789 g/mL × 27.1 mL

m = 21.4 g