Zolpidem is a common hypnotic with the chemical formula C19H₂1N3O. Stilnox - the brand name of zolpidem in Vietnam- is the hemitartratre of zolpidem: meaning that the salt contains 1 molecule of tartaric acid for 2 molecules of zolpidem: (C₁9H₂1N30)₂ C₂H₂O- The molar mass (molecular weight) of zolpidem is 307.39 g/mol while the molecular weight of the hemitartratre salt is 764.87 g/mol. a- We want to prepare 100mL of a 1mM zolpidem solution. How much zolpidem base should we weigh ? b- How much should we weigh if we start with the hemitartrate salt ? Select one: O a. a-30.7 mg, b-38.2 mg b. a-30.7 mg, b- 76.5 mg c. a- 61.5 mg, b- 76.5 mg

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.