What is the enthalpy of 2no2(g) yields n2(g) + 2o2 (g)

-67.8 kJ

Step-by-step explanation:

                        2NO₂(g) ⇌ N₂(g) + 2O₂(g)

ΔH°f/kJ·mol⁻¹:   +33.9            0         0

ΔH°r = ΣΔH°f(products) - ΣΔH°f(reactants)

         =             0            -         2(33.9)

         = -67.8 kJ

the molecules move in straight line until they collide with each other or with the walls of the container. collisions are perfectly elastic; when two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved.

explanation:

i don,t know so just answer mine