The reaction of three molecules of fluorine gas with a Xe atom produces the substance xenon hexafluoride, XeF6:
Xe(g) + 3 F2(g) → XeF6(s)
(a) Draw a Lewis structure for XeF6., (b) If you try to use the VSEPR model to predict the molecular geometry of XeF6, you run into a problem. What is it? (c) What could you do to resolve the difficulty in part (b)? (d) The molecule IF7 has a pentagonal-bipyramidal structure (five equatorial fluorine atoms at the vertices of a regular pentagon and two axial fluorine atoms). Based on the structure of IF7, suggest a structure for XeF6.
th th Chapter 8 from “Introductory Chemistry” by Zumdahl and Decoste, 7 /8 edition Pg 167. COUNTING BY WEIGHING Average mass = total mass Number of item/variables Pg 170. ATOMIC MASSES: COUNTING ATOMS BY WEIGHING Want to know how many molecules are needed to make carbon dioxide C (s) + O2(g) CO 2g) 1 atom + 1 molecule 1 molecule *because atoms weigh so little and kilograms would be too large of a measurement, chemists use Atomic Mass Unit (amu) In terms of grams: 1 amu = 1.66 x 10 -24g Average Atomic Mass: (means what its named…duh) Ex: Mass of 1000 natural C atoms = (1000 atoms) (12.01 (amu/atom))