To find the mass of a liquid given its volume and density, we can use the formula:
Mass = Volume × Density
In this case, the volume of ethyl acetate is 69.2 ml and the density is 0.900 g/ml. Plugging in these values gives us:
Mass = 69.2 ml × 0.900 g/ml
Calculating this, we get:
Mass = 62.28 g
Therefore, the mass of the 69.2 ml sample of ethyl acetate at 20.0 degrees Celsius is 62.28 grams.