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Posted by 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 - , 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 - , Sunday, February 15, 2009 at 7:37pm

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

  • Chemistry - , 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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