You weigh a dry flask, and place a chunk of solid into it, then weigh it again.

Question

You weigh a dry flask, and place a chunk of solid into it, then weigh it again. You then fill the flask to the top with water and weigh the full flask. Finally, you take the solid out, fill the flask to the top with water and weigh t once more Mass of flask in (g) 56.5625 Mass of flask plus solid (g) 135.3538 Mass of flask plus solid and water (g) 146.5245 Mass of flask filled with water (g) 83.2776 Density of water at the measured water temperature (g/cc) 0.9961 Calculate the following: Density of the solid unknown in (g/cc)

Explanation / Answer

Density = Mass / Volume

Mass of Solid = Mass of flask plus solid - Mass of flask

Mass of Solid = 135.3538 - 56.5625

Mass of Solid = 78.7913 g

Mass of solid and water = 146.5245 - 56.5625 = 89.962 g

Mass of water = 89.962 - 78.7913 = 11.1707 g

Volume of water = 11.1707 / 0.9961 = 11.2144 cc

Mass of water = 83.2776 - 56.5625 = 26.7151 g

Volume of water after taking out solid = 26.7151 / 0.9961 = 26.8197 cc

Difference in volume of water = volume of solid = 26.8197 - 11.2144 = 15.6053 cc

Density of the solid unknown = 78.7913 / 15.6053 = 5.049 g/cc

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