SOLUTION: How much pure acid is in 640 milliliters of a 11% solution?

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Question 985979: How much pure acid is in 640 milliliters of a 11% solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
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 %28640%2Fd%29%280.11%29%28grams%29 pure acid is present.