Consider the reaction:

2 HBr (g) → H₂ (g) + Br₂ (g)

a. Express the rate of the reaction in terms of the change in concentration of each of the reactants and products.

Video transcript

Hey everyone in this example we need to use change in concentration of our reactant and products to write the rate of our reaction. So we're given the reaction below which shows the synthesis of di nitrogen tetroxide. So to begin out our rate expression, we should say that the rate is equal to our change in concentration of our nitrogen dioxide gas divided by the change in time. Where we're going to multiply this by the coefficient from our equation which is two over because this is a reactant, we're going to have a coefficient that is negative. So we should have negative one half since we want our coefficient to be in the denominator, this is then going to be set equal to the change in concentration of our nitrogen tetroxide gas divided by the change in time where we have a coefficient of one according to our given equation. And so this is going to just have a positive coefficient of one which we don't have to write in because this is a product that we're gaining. And so for our final answer, this entire expression here is going to be our reaction rate according to our concentration of reactant and products. So what's boxed in is our final answer? I hope that everything I explained was clear. If you have any questions, please leave them down below and I will see everyone in the next practice video