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April 20, 2014

Homework Help: chemisty problem help

Posted by Tagen on Thursday, February 8, 2007 at 9:42pm.

Carbon-12 contains 6 protons and 6 neutrons. The radius of the nucleus is approximately 70 pm. Calculate the volume of the nucleus and the volume of the atom. What percentage of the carbon atom's volume is occupied by the nucleus?

Can someone tell me how to do this?

Volume= 4/3 PI radius^3

calculate the volume of the nucleus from this formula.

A solution of ethanol (C2H5OH) in water is prepared by dissolving 68.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 225.0 mL of solution. What is the molarity of the ethanol in this solution? Could you show me how to work this problem?

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