Under the same conditions of temperature and pressure does hydrogen iodide or ammonia effuse faster.

answer: h+ its less than oh

explanation:

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)