The thermodynamic values from part A will be useful as you work through part B:

ΔH∘rxn 243.5kJ/mol
ΔS∘rxn 172.0J/(mol⋅K)
Calculate the equilibrium constant for the following reaction at room temperature, 25 ∘C:

BaCO3(s)→BaO(s)+CO2(g)

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

Which of the four hypothetical substances you investigated would be most harmful to living organisms? 50 points!

Organisms are classified as producer or consumers according to the way they ?