A chemist is using 344 milliliters of a solution of acid and water. If 13.2% of the solution is acid, how many milliliters of acid are there? Round your answer to the nearest tenth.
13.2% of 344 milliliters is (0.132)(344) = <<(0.132)(344)=45.408>>45.408.
Rounding to the nearest tenth gives 45.4 milliliters. Answer: \boxed{45.4}.