Ch.4 - Chemical Quantities & Aqueous ReactionsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: 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 t

Solution: 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 t

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.

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.

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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