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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