Question

To answer this question use the hydrazine-nitrogen tetroxide rocket fuel reaction:

2N2H4 + N2O4 = 3N2 + 4H2O.

How many moles of N2H4 are needed to react with 4 moles of N2O4

A) 4 moles
B) 2 moles
C) 8 moles
D) 6 moles

Answer 1

The moles of N2H4 needed to react with 4 moles of N2O4 is calculated as follows

from the reacting equation

2N2H4 + N2O4 -----> 3N2 + 4 H2O

the reacting ratio between N2H4 to N2O4 is 2 :1, therefore the moles of N2O4 is = 4moles x 2 = 8 moles