Question 985979
This one REQUIRES density, or answering is not possible.  Even if the acid in pure form were a liquid, the density will still be needed.  Especially the density of the 11% solution must be given.


Assuming the density of the solution is d  grams/ml, and the pure acid is a solid,
then  {{{(640/d)(0.11)(grams)}}} pure acid is present.