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An unknown object has a mass of 38.544 g (top loading balance±0.001g). The objec

ID: 676318 • Letter: A

Question

An unknown object has a mass of 38.544 g (top loading balance±0.001g). The objects volume is determined by displacementof water in a 100mL measuring cylinder (±5%): the volumereading before the object is immersed is 52.4mL, and afterimmersion the reading is 85.7mL. The work I have done so far indicates that the mass range ofthe object is: 38.543g-38.545g and the volume range is: 28.3mL-38.3mL... I dont know if thisis right so please check it before you start working on the actuallproblem. What is the greatest/lowest possible density? What value should be reported fot the density? An unknown object has a mass of 38.544 g (top loading balance±0.001g). The objects volume is determined by displacementof water in a 100mL measuring cylinder (±5%): the volumereading before the object is immersed is 52.4mL, and afterimmersion the reading is 85.7mL. The work I have done so far indicates that the mass range ofthe object is: 38.543g-38.545g and the volume range is: 28.3mL-38.3mL... I dont know if thisis right so please check it before you start working on the actuallproblem. What is the greatest/lowest possible density? What value should be reported fot the density?

Explanation / Answer

density is what we are looking for: density = mass / volume volume is obtained by subtracting the last value of the graduatedcylinder from the first value: 85.7-52.4mL = 33.3mL mass = 38.543 - 38.545 g (use both values, one after the other, in order to get minimum andmaximum density) mass / volume = 38.543g/33.3mL = mass / volume = 38.545g/33.3mL =

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