Question

Given the following chemical equation, determine how many grams of N2 are produced by 8.58 g of H2O2 and 5.62 g of N2H4.
2H2O2(l)+N2H4(l)=4H2O(g)+N2(g)

Answer 1

This is a limiting reagent (LR) problem; you know that because amounts are given for BOTH reactants.
mols H2O2 = grams/molar mass = ?
mols N2H4 = grams/molar mass = ?

Using the coefficients in the balanced equation, convert mols H2O2 to mols N2.
Do the same to convert mols N2H4 to mols N2.
It is likely that the numbers will not agree which means one of them is not right; the correct value in LR problems is ALWAYS the smaller value and the reagent responsible for that smaller value is the LR.

Now use the smaller value and convert that to grams. g = mols N2 x molar mass N2