Ma huang, an extract from the ephedra species of plants, contains ephedrine. The Chinese have used this herb for more than 5000 years to treat asthma. More recently, ephedrine has been used in diet pills that can be purchased over the counter in herbal medicine shops. However, very serious concerns have been raised regarding these pills following reports that their use led to serious heart problems. 

(a) A molecular model of ephedrine is drawn below. From this determine the molecular formula for ephedrine and calculate its molar mass. 

(b) What is the weight percent of carbon in ephedrine? 

(c) Calculate the amount (moles) of ephedrine in a 0.125 g sample. 

(d) How many molecules of ephedrine are there in 0.125 g? How many C atoms?

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Ephedrine