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finding volume and weight using density

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Tanya:
Please *delete me*!!!  I have never taken any form of Chemistry before and am totally lost on how to work this problem... I need a formula...
  An Erlenmeyer flask weighs 241.3g when empty.  When filled w/water (d=1.00 g/cm3), the flask and its contents weigh 489.1g. a) What is the flasks volume? b) How much does the flask weigh when filled w/chloroform (d=1.48 g/cm3)??
 *I'm not asking anyone to work the prob. for me...I HAVE to figure out how to do this, but right now I don't even know where to start...I know O need to use some sort of formula, but I'm cluless!!!

Mitch:
First figure out how much mass of water was added, then use that mass along with the density to figure out the volume of the flask.

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