In the reaction between co and fe3o4, the theoretical yield in an experiment is calculated to be 47.2 gfe. when a careless chemistry student carries out the experiment, the actual yield is 42.9 fe. calculatethe percentage yield.
a) 88.5%
b) 70.2%
c) 89.9%
d) 74.3%
e) 90.9%

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.