Consider the reaction: 2hbr(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.

b)in the first 25.0s of this reaction, the concentration of hbr dropped from 0.600m to 0.512m. calculate the average rate of the reaction.

c)if the volume of the reactino vessel in part b was 1.50l, what amount of br2(in moles) was formed during the first 15.0s of the reaciton?