High levels of ozone (O3) make rubber deteriorate, green plants turn brown, and cause people to have difficulty breathing.

a. Calculate ΔG at 298 K for the formation of 1 mole of O3 from O2 in urban smog, where [O2] = 0.210 atm and [O3] = 5.00 × 10^−7 atm.
b. Is the formation of O3 from O2 favored at all T, no T, high T, or low T?
c. Calculate ΔG∘ for this reaction at 298 K.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

it is the most commonly accepted one

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.