Homework Help: Chemistry

Posted by David on Monday, October 4, 2010 at 5:56pm.

A graduated cylinder massed at 34.56g and then 8.6 ml was added of an unkonwn liquid this brought the mass to 45.87g. What is the density?

I'm not sure how to go about this. Is the 34.56g unneccessary information?

Or, do you subtract 45.87-34.56= 11.31 then do mass 11.31/volume8.6 = 1.315 which in sig fig is 1.3g/ml

Chemistry - DrBob222, Monday, October 4, 2010 at 6:06pm
Mass empty cylinder = 34.56g
mass cylinder + liquid = 45.87g
The difference is the mass of the 8.6 mL of the liquid that was added.
Density = mass/volume
Chemistry - David, Monday, October 4, 2010 at 6:09pm
so did I do it right?
Chemistry - DrBob222, Monday, October 4, 2010 at 6:14pm
You did it exactly right. Bravo! I didn't scroll down far enough to see the bottom of the post where you had worked it out.
Chemistry - David, Monday, October 4, 2010 at 6:26pm
Oh thank you!

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