The mask of an empty flask is 17.4916 g, and its mass when filled with water at 20.0°C (density = 0.9982 g/mL) is 43.9616 g. The density of "heavy water" at 20.0°C is 1.1053 g/mL. What is the mass of the flask when filled with heavy water at 20.0°C?

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Quizplus · Accepted Answer

First, find the volume of water the flask holds by using the mass of water it contains: mass of water = mass of flask with water - mass of empty flask = 43.9616 g - 17.4916 g = 26.47 g. Since the density of water is 0.9982 g/mL, the volume of water = mass/density = 26.47 g / 0.9982 g/mL = 26.5 mL (approximately). To find the mass of the flask filled with heavy water, use the volume of the flask (26.5 mL) and the density of heavy water (1.1053 g/mL): mass of heavy water = volume * density = 26.5 mL * 1.1053 g/mL = 29.31045 g. Add this to the mass of the empty flask to get the total mass: 29.31045 g + 17.4916 g = 46.8016 g.

The Mask of an Empty Flask Is 17