Posted by **Ben** on Sunday, February 15, 2009 at 6:33pm.

2. Calculate the volume for the following object If you know that the object has a mass of 24 grams and the density is 12 g/ml. I tried to get rid of the 24 by multiplying it on both sides, and dividing on both sides, but neither worked. What will then? Thanks!

- Chemistry -
**GK**, Sunday, February 15, 2009 at 7:36pm
**Density = Mass / Volume**

Multiplying both sides by bolume,

**Volume x Density = Mass**

Dividing both sides by density,

**Volume = Mass / Density**

V = 24 g / 12 g/mL = ____?

- Chemistry -
**bobpursley**, Sunday, February 15, 2009 at 7:37pm
density=mass/volume so

volume = mass/denstiy=24g/12g/ml= 2ml

- Chemistry -
**Damon**, Sunday, February 15, 2009 at 7:38pm
24 grams * (1 ml/12 grams) = 2 ml

note I wrote 1 ml/12 g

instead of 12 g/1 ml

so that the grams cancel

If you multiply something by something that is the same top and bottom, for example in this case 12 g and 1 ml, you do not change the amount, only the units. That is an easy way to do this sort of problem particularly if you have a whole string of unit changes in one problem.

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