# chem 101March 31, 2011 8:22 PM   Subscribe

This is an easy Chem. 101 ? inside for anyone (seriously anyone) that's been through a course like this. Thanks!

The mass of your solid is found to be 17.62 grams. The initial volume of water in your 10-mL graduated cylinder before adding the solid is 2.7 mL. The final volume after adding your solid is 6.4 mL. What is the density of your solid in g/mL (using the correct number of significant figures)?
posted by Benzle to Education (11 answers total)

This post was deleted for the following reason: Oooookiedoke. -- cortex

posted by lalex at 8:25 PM on March 31, 2011 [6 favorites]

If it's so easy, you should be able to do it yourself.

My 8th grader can figure this one out. If you can't, you shouldn't be in the class....

(what's the volume of your solid? divide the mass by the volume. et voila, density. The rest is left as an exercise for the student.)
posted by jlkr at 8:31 PM on March 31, 2011

Wow, yeah.
posted by unknowncommand at 8:31 PM on March 31, 2011

Seriously? The units that you're supposed to give the answer in tell you how to solve the problem.
posted by supercres at 8:32 PM on March 31, 2011

COLD BUSTED
posted by spikeleemajortomdickandharryconnickjrmints at 8:33 PM on March 31, 2011

lalex, the second and last one were not homework, also fuck the rest of you as well.
posted by Benzle at 8:33 PM on March 31, 2011 [1 favorite]

spikeleemajortomdickandharryconnickjrmints, you seem cool though.
posted by Benzle at 8:34 PM on March 31, 2011

For the part of the problem that isn't given in the units:

http://en.wikipedia.org/wiki/Significant_figures
For multiplication and division, the result should have as many significant digits as the measured number with the smallest number of significant digits.
For addition and subtraction, the result should have as many decimal places as the measured number with the smallest number of decimal places.
posted by hot soup at 8:34 PM on March 31, 2011

Thank you hot soup,
posted by Benzle at 8:36 PM on March 31, 2011

lalex, the second and last one were not homework, also fuck the rest of you as well.

nice, you should be banned.
posted by lalex at 8:38 PM on March 31, 2011

Wow, didn't preview:

http://faq.metafilter.com/#89
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posted by hot soup at 8:39 PM on March 31, 2011

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