Apharmaceutical chemist is working on a new large-scale synthesis for the popular pain reliever, naproxen. to be useful, however, the synthesis must be highly stereospecific, for whereas the (s) isomer of naproxen is a safe pain-reducing drug, the (r) isomer is a potentially harmful liver toxin. to determine the purity of the synthesized product, the chemist dissolves 81.6 mg of obtained product in 2.40 ml of solvent and measures the optical activity of the sample in a 5.00-cm tube, observing a value of +1.03? . a 0.500 g/ml solution of pure (s) isomer is measured under identical conditions, giving a value of + 16.5 ? .part a: continue your analysis by finding the specific rotation, [? ], of the synthesized product. express your answer in degrees. part b: determine the optical purity of the obtained product, using the calculated specific rotation values for the pure (s)-naproxen and the synthesized product. express your answer as a percentage. part c: assuming that the only impurity present in the synthesized product is the (r) enantiomer, calculate the percentage of (s)-naproxen it contains, using the previously determined value for optical purity. this can be done by adding the following two equations where d and l represent the percent quantities of the two enantiomers: d ? l = optical purityd + l = 100%

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.

56 moles of   lieter in chemistry

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.