What is the mole ratio of nitrogen to hydrogen in N2H4?

##N_2H_4## (hydrazine) says that there are ##2## nitrogen atoms for every ##4## hydrogen atoms in the molecule.

As soon as we know that, we know that there are ##2## mols of nitrogen atoms for every ##4## mols of hydrogen atoms.

##(x cancel"mol")/(y cancel"mol") = x/y##

Therefore, the mol ratio is:

##2/4 => color(blue)(1/2)##