Chapter 3, Problem 11E

Determine the number of moles of
a. ${\text{N}}_{\text{2}}{\text{O}}_{\text{4}}$ in a 115 g sample
b. N atoms in 43.5 g of sample
c. N atoms in a sample of ${\text{C}}_{\text{7}}{\text{H}}_{\text{5}}{\left({\text{NO}}_{\text{2}}\right)}_{\text{2}}$ that has the same of O atoms as 12.4 g ${\text{C}}_{\text{2}}{\text{H}}_{\text{12}}{\text{O}}_{\text{6}}\text{.}$