Xenon difluoride is written XeF₂. With school atomic masses the molar mass is 169 g/mol. Xenon difluoride is a linear molecule of xenon and two fluorines.
H₂O
WaterNH₃
AmmoniaCO₂
Carbon DioxideH₂O₂
Hydrogen PeroxideSO₂
Sulfur DioxideNO₂
Nitrogen DioxideHCl
Hydrochloric AcidH₂SO₄
Sulfuric AcidHNO₃
Nitric AcidCH₄
MethaneC₂H₆
EthaneC₃H₈
PropaneC₄H₁₀
ButaneC₂H₄
EthyleneC₂H₂
AcetyleneC₆H₆
BenzeneC₇H₈
TolueneC₁₀H₈
NaphthaleneC₆H₁₂
CyclohexaneCH₃OH
MethanolC₂H₅OH
EthanolCH₃COOH
Acetic AcidHCHO
FormaldehydeCH₃COCH₃
AcetoneC₄H₁₀O
Diethyl EtherC₂H₇N
EthylamineC₂H₅NO
AcetamideC₆H₁₂O₆
GlucoseC₆H₁₂O₆
FructoseC₁₂H₂₂O₁₁
SucroseCO(NH₂)₂
UreaC₂₇H₄₆O
CholesterolC₉H₈O₄
AspirinC₈H₉NO₂
AcetaminophenC₁₃H₁₈O₂
IbuprofenC₈H₁₀N₄O₂
CaffeineC₆H₆N₂O
NicotinamideC₆H₈O₆
Ascorbic AcidC₁₆H₁₈N₂O₄S
Penicillin GC₂H₆O₂
Ethylene GlycolC₈H₈
StyreneC₂H₃Cl
Vinyl ChlorideC₃H₅NO
AcrylamideC₆H₁₁NO
CaprolactamLiCl
Lithium chlorideNa₂O
Sodium oxideNaCl
Sodium chlorideMgF₂
Magnesium fluorideAlCl₃
Aluminum chlorideCaO
Calcium oxideCaC₂
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Copper(II) oxideCu₂O
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Lithium fluoride(NH₄)₂S
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Nickel(II) chlorideKCN
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Iron(II) oxideHg₂Cl₂
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Silicon dioxideP₄O₁₀
Tetraphosphorus decaoxideN₂O₅
Dinitrogen pentoxideCO
Carbon monoxideHF
Hydrogen fluoridePCl₅
Phosphorus pentachlorideCF₄
Carbon tetrafluorideSF₆
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Nitrogen tribromideN₂O
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Dinitrogen trioxideCS₂
Carbon disulfideCl₂O₇
Dichlorine heptoxideBF₃
Boron trifluorideCCl₄
Carbon tetrachlorideSO₃
Sulfur trioxideSiCl₄
Silicon tetrachlorideP₂S₅
Diphosphorus pentasulfideBCl₃
Boron trichloridePBr₃
Phosphorus tribromideCBr₄
Carbon tetrabromideNF₃
Nitrogen trifluorideOF₂
Oxygen difluorideNCl₃
Nitrogen trichlorideH₂S
Hydrogen sulfidePH₃
PhosphineBeCl₂
Beryllium chlorideHCN
Hydrogen cyanideClF₃
Chlorine trifluorideXeF₂
Xenon difluorideTrigonal bipyramidal
Linear
Xenon difluoride is a linear molecule of xenon and two fluorines. Three lone pairs on xenon sit in the equatorial plane, and the fluorines occupy the axial ends. It is one of the stable xenon fluorides and is also used as a fluorinating reagent.
Properties
Molar mass
169.29 g/mol
Melting point
129 °C
Bond type
Covalent
Geometry
Linear
Uses
Linear VSEPR example · Fluorinating reagent
Exam note
Systematic name
Xenon difluoride
Compound class
It is a nonpolar covalent molecule. The electron geometry is trigonal bipyramidal and the molecular shape is linear.
Formula unit
Xenon has five electron groups: two bonds and three lone pairs. The lone pairs occupy equatorial sites, so the fluorines sit 180 degrees apart.
Watch the formula
With school atomic masses the molar mass is 169 g/mol: 131 (Xe) + 2×19 (F). Because it is AX₂E₃ the molecule is linear; that linear shape is not the same as sp hybridization in CO₂. Identical fluorines at 180 degrees keep the molecule nonpolar. It is a noble-gas compound.
Molar mass calculation
Masses given in the question come first. When none are given, school values put the total at 169 g/mol.
+
= 169 g/mol
XeF₂
The same count with periodic-table atomic masses gives 169.286 g/mol.
| Element | Atom count | Contribution (g/mol) | Mass % |
|---|---|---|---|
| Fluorine (F) | 2 | 37.996 | 22.4 |
| Xenon (Xe) | 1 | 131.290 | 77.6 |
| Total | 169.286 | 100 |
Common questions
What is xenon difluoride?
Xenon difluoride is a linear molecule of xenon and two fluorines. Three lone pairs on xenon sit in the equatorial plane, and the fluorines occupy the axial ends. It is one of the stable xenon fluorides and is also used as a fluorinating reagent.
What is the formula of xenon difluoride?
Xenon difluoride is written XeF₂. The systematic name is Xenon difluoride. Xenon has five electron groups: two bonds and three lone pairs. The lone pairs occupy equatorial sites, so the fluorines sit 180 degrees apart.
What is the molar mass of xenon difluoride?
Xenon difluoride has a molar mass of 169.286 g/mol from the atomic masses on the periodic table. With school atomic masses the total is 169 g/mol, counting 2 fluorine and 1 xenon.
What is xenon difluoride used for?
Xenon difluoride is used for linear VSEPR example and fluorinating reagent.
What should you watch for with xenon difluoride on an exam?
With school atomic masses the molar mass is 169 g/mol: 131 (Xe) + 2×19 (F). Because it is AX₂E₃ the molecule is linear; that linear shape is not the same as sp hybridization in CO₂. Identical fluorines at 180 degrees keep the molecule nonpolar. It is a noble-gas compound.