Calculate the mass percent of N in each of the following:
a. N2O5, dinitrogen pentoxide
b. NH4Cl, expectorant in cough medicine
c. C2H8N2, dimethylhydrazine, rocket fuel
d. C9H15N5O, Rogaine, stimulates hair growth
e. C14H22N2O, Lidocaine, local anesthetic
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