The equation below represents a reaction of methanethiol and iodine, producing dimethyl disulfide and hydrogen iodide. Identify the polarity of an H-I bond and the polarity of an S-S bond.

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

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)