Question 947618
What volume of ethanol?


{{{11.86*grams*(1/0.789)(mililiter/gram)=highlight(15.0317*milliliter)}}}.  You want this to no more than three significant figures:  15.0 mililiters.


Be aware that 1 milliliter is equal to 1 cubic centimeter.
Be aware, diameter is two of the radii.


Your goal asked is find the inner diameter of the cylinder.  You have the correct volume formula for a cylinder.  


Look at the volume formula, and solve for r.
{{{V=pi*h*r^2}}}
{{{pi*h*r^2=V}}}
{{{highlight_green(r^2=V/(pi*h))}}}
You want r, not to stop at just r^2.
THIS should make sense:   {{{highlight_green(r=sqrt(V/(pi*h)))}}}