For each of the following gas-sphase reactions, indicate how the rate of disappearance of each reactant is

Question:

For each of the following gas-sphase reactions, indicate how the rate of disappearance of each reactant is related to the rate of appearance of each product:
(a) H2O2(g) --→ H2(g) + O2(g)
(b) 2 N2O(g) --→ 2 N2(g) + O2(g)
(c) N2(g) + 3 H2(g) --→ 2 NH3(g)
(d) C2H5NH2(g) --→ C2H4(g) + NH3(g)?