Question

If 0.30 mol N2H4 is reacted with 0.50 mol N2O4, how many moles of N2 can be formed?

Answer 1

N2H4 + N2O2 = 2H2O + 2 N2

limited by .3 mol N2H4
so get .6 mol N2

Answer 2

However, the desired reaction is probably

2N2H4 + N2O4 = 3N2 + 4H2O

adjust the moles ratio accordingly