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

a. rate=12Δ[HBr]Δt=−Δ[H2]Δt=−Δ[Br2]Δtr ate=12Δ[HBr]Δt=−Δ[H2]Δt=−Δ[Br2]Δt
b. rate=−Δ[HBr]Δt=12Δ[H2]Δt=12Δ[Br2]Δt rate=−Δ[HBr]Δt=12Δ[H2]Δt=12Δ[Br2]Δt
c. rate=−12Δ[HBr]Δt=Δ[H2]Δt=Δ[Br2]Δtra te=−12Δ[HBr]Δt=Δ[H2]Δt=Δ[Br2]Δt
d. rate=Δ[HBr]Δt=−12Δ[H2]Δt=−12Δ[Br2]Δ t

c. rate=−1/2Δ[HBr]/Δt=Δ[H2]/Δt=Δ[Br2]/Δt

Explanation:

Hello,

In this case, the undergoing chemical reaction is:

Thus, the rate is given as:

It is necessary to remember that each concentration to time interval is divided into the stoichiometric coefficient, that is why HBr has a 1/2. Moreover, the concentration HBr is negative since it is a reactant and it has a negative rate due to its consumption.

Therefore, the answer is:

c. rate=−1/2Δ[HBr]/Δt=Δ[H2]/Δt=Δ[Br2]/Δt

Best regards.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.