Homework Help: SCIENCE?CHEMISTRY***

Posted by ANDY on Friday, May 14, 2010 at 9:49pm.

DR Bob,
can you go thru the steps to work this out please....
how many grams of alcohol with a density of 0.900 g/cm ^3 (cm cubed) will have the same volume as 20.0g of mercury,with a density of 13.6 g/cm ^3

Do you have to find the volume of mercury first???
I know the answer is 1.32....i just dont know how to get there....
Thanks ANDY

SCIENCE?CHEMISTRY*** - drwls, Saturday, May 15, 2010 at 1:03am
The volumes are the same. Volume in mass divided by density.
(mass/density) of mercury = (mass/density) of alcohol

Alcohol mass = [(alcohol density)/(mercury density)]*(mecury mass)
= (0.900/13.6)*20 = 1.324 g
Rouded to two figures, that is 1.32 g
SCIENCE?CHEMISTRY*** - ANDY, Sunday, May 16, 2010 at 12:02am
thanks..... andy

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