Buckminsterfullerence is called an allotrope of carbon because it was discovered during an experiment involving a cluster of beam which uses laser to vapourise a graphite rod in a helium atmosphere to produce carbon plasmas.a mass sectrometry evidence from the experiment showed that carbon molecules with C60 were forming with a spheroidal geometry.so therefore it was included as an allotrope of carbon.
We assume that the method that made use of urea was able to recover all of the recoverable substance. The method in question is the method that makes use of water. The total amount of substance is 43 mg/dl. The recovered amount is 25 mg/dl. The percent recovery is (25 mg/dl / 43 mg/dl) * 100 = 58.14%
