Posted by Tagen on .
Carbon12 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?

chemisty problem help 
karin,
the density of ethanol a colorless liquid that is commonly known as grain alcohol is 0.798 grams per milliliters calculate the mass of 17.4 milliliters of the liquid