Answer to Question #81744 in General Chemistry for Kimberly A Bonitto

Question

Consider this reaction, which occurs in the atmosphere and contributes to photochemical smog:

2SO2(g) + O2(g) →2SO3(g)

If there is 17.98 g SO2 and excess O2 present, the reaction yields 18.0 g SO3. Calculate the percent yield for the reaction.


%

Answer 1

Solution:

2SO2+O2=2SO3

1.n=m/M

M(SO2)=32+2×16=64 gram/mole;

n(SO2)=17.98/64=0.281 mol;

2.n(SO2)=n(SO3)=0.281 mol;

3.m=n×M;

M(SO3)=32+16×3=80 gram/mole;

m(SO3)=0.281×80=22.48 gram;

4.η=m(practical output)/m(theoretical output)×100%;

η(SO3)=m(practical SO3)/m(theoretical SO3)×100%;

η(SO3)=18/22.48×100%=80.1%

Answer:η(SO3)=80.1%.