Calculate H for the reaction of sulfur dioxide with oxygen. 2SO2(g) + O2(g) —> 2SO3(g)

(H SO2(g) = -296.8 kJ/mol; HSO3(g) = -395.7 kJ/mol)

a. -98.9 kJ
b. -197.8 kJ
c. 197.8 kJ
d. Not enough information is given.

and an explanation if possible please

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.