185k views
0 votes
Plz help

A student determines that the mass of a metal rod
is 12.0 g. He places 10.0 mL of water in a 25 ml
graduated cylinder. When the metal rod is placed
in the water, the graduated cylinder then reads
15,0 mL. What is the density of the metal rod?

User Dratewka
by
7.0k points

1 Answer

6 votes

Answer:

Step-by-step explanation:

There's a great many assumptions in this question. We have to assume that the rod was completely immersed. We also have to note that we can read the volumes to 3 places accurately. School graduated cylinders are not that accurate.

Leaving those objections aside, here is how the question should be done.

Final volume = 15.0 mL

Initial volume = 10.0 mL

Water displaced = 5.0 mL

The amount of water displaced is the same as the volume of the metal rod.

Finally the mass of the rod is 12.0 grams.

Density = mass / volume

Density = 12.0 grams / 5.0 mL

density= 2.4 grams / mL a mL and a cc^3 are the same thing.

density = 2.4 grams / cc^3

User Jengify
by
7.1k points