Calculate the percent by mass of N in each of the following compounds:
a. N2O5, dinitrogen pentoxide
b. NH4NO3, ammonium nitrate, fertilizer
c. C2H8N2, dimethylhydrazine, rocket fuel
d. C9H15N5O, Rogaine, stimulates hair growth
e. C14H22N2O, Lidocaine, local anesthetic
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