When the reaction consumes 2.0 g of liquidN2O4, it releases 24.8 kJ of heat. What is the value of delta H for the chemical equation as written? A reaction that is used to propel rockets is N2O4 (l) +2N2H4(l) -->> 3N2(g) + 4H2O (g). This reaction has the advantage that neither product is toxic, so no dangerous pollution is released.