A student measured a mass of a metal bar as 57.21 g. The student filled a gradua
ID: 473505 • Letter: A
Question
A student measured a mass of a metal bar as 57.21 g. The student filled a graduated cylinder with water and determined the volume of water to be 48.60 ml Then the student placed the metal bar into the graduated cylinder and determined the new volume to be 53.70 mL Calculate the density of the metal and identify its name from the choices that appear in Table 1.2. A chemist has a 9.50 ml, sample of rubbing alcohol (isopropyl alcohol). What is the mass of the sample? What additional information do you need in order to calculate the mass? What is the mass of 25 ml of water (measured at 4 degree C)?Explanation / Answer
4. Density = mass / volume
Volume = water displaced by metal when placed in water filled graduated cylinder
= 53.70 - 48.60 = 5.1 ml
Now, calculate density, d = 57.21 / 5.1 = 11.22 g/ml
Density of metal is near to that of lead. Hence we can say given metal is lead.
5. Volume = 9.50 ml
We need value of density of rubbing alcohol to calculate the mass
Density of rubbing alcohol = 0.7854 g/ml
Now, d = m / v
Mass = density x volume = 0.7854 x 9.50 = 7.46 g.
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