Problem: Ritalin is the trade name of a drug, methylphenidate, used to treat attention-deficit/hyperactivity disorder in young adults. The chemical structure of methylphenidate is shown in the figure below.A tablet contains a 35.0-mg dose of Ritalin. Assuming all the drug ends up in the bloodstream, and the average man has a total blood volume of 5.0 L, calculate the initial molarity of Ritalin in a mans bloodstream.

FREE Expert Solution

Recall: Molarity is the ratio of moles of solute to volume of the solution in Liters.

We first need to determine the moles of Ritalin before we can calculate the molarity.

From the structure of Ritalin, we can determine it's molecular formula: C14H19NO2. The molar mass of Ritalin is:

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Problem Details

Ritalin is the trade name of a drug, methylphenidate, used to treat attention-deficit/hyperactivity disorder in young adults. The chemical structure of methylphenidate is shown in the figure below.

The structure of Ritalin (methylphenidate) is a central C single bonded below to H and left to a benzene ring.  Single bonded above the central C is a C.  That C is double bonded to O and single bonded to O, which is single bonded to a CH3. Single bonded right of the central C is a C that forms the upper left vertex of a six-membered hexagon ring, arranged with its points up and down.  All the vertices are Cs except for the top point, which is an N, and all vertices are connected by single bonds.  The top point (N) and upper left vertex are single bonded to H; all other vertices are single bonded to two Hs.

A tablet contains a 35.0-mg dose of Ritalin. Assuming all the drug ends up in the bloodstream, and the average man has a total blood volume of 5.0 L, calculate the initial molarity of Ritalin in a mans bloodstream.

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