The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?

The correct answer is 400 KJ/mol.  

The given reaction:  

NO₂ (g) + CO₂ (g) ⇒ NO (g) + CO₂ (g)

The activation energy or Ea for the reaction is 300 KJ/mol.  

The change in enthalpy for the reaction is, ΔH = -100 KJ/mol, this is for forward reaction, for backward or reverse reaction, ΔH = 100 KJ/mol

The Ea for reverse reaction is calculated by using the formula,  

Ea (forward) + ΔH

= 300 + (+100)

= 400 KJ/mol

Therefore, the activation energy for the reverse reaction is 400 KJ/mol

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

2b2t

explanation:

2b2t