General Chemistry Exam 2 with complete
solution verified 100% correct
How pto pfind pthe pmass pof pa pmolecule? p- pAnswer p- p p pg pmolecule p--> pmol pmolecule p-->
pAvogadro's p#
Example:
(1 pmol pCO2 p/ p44.01g pCO2) p
xp
(6.022 px p10^23 pCO2 pmolecules p/ p1 pmol pCO2)
OR p(to porganize pthe pequation/steps)
(44.01g pCO2 p/ p1 pmol pCO2)
x
(1 pmol pCO2 p/ p6.022 px p10^23 pCO2 pmolecules)
Mass pPercent pComposition p
(Mass pPercent) p- pAnswer p- p p p(Mass pof pelement pX pin p1 pmol pof pcompound p/
Mass pof p1 pmol pof pthe pcompound) px p100%
Example:
,(2 px pmolar pmass pCl p/ pmolar pmass pCCl2F2) px p100%
How pto pcalculate pthe pnumber pof pmoles pof peach pelement pthat pare ppresent pin peach psample? p-
pAnswer p- p p pExample:
0.857g pH px p(1 pmol pH p/ p1.01 pg pH) p= p0.849 pmol pH
6.86g pO px p(1 pmol pO p/ p16.00g pO) p= p0.429 pmol pO
[Divide peach p# pof pmoles pby pfewest pmoles]
0.849 pmol pH p/ p0.429 p= p1.98 p=> p2 p
0.429 pmol pO p/ p0.429 p= p1
So, pthe pempirical pcompound pof pHydrogen pand pOxygen pis pH2O
How pto pcalculate pMolecular pMass p[n] p
(After pfinding pEmpirical pFormula pand pgiven pMolar pMass pin pthe pproblem)? p- pAnswer p- p p
pMolecular pMass p[n] p=> p
(molar pmass p/ pempirical pformula pmolar pmass)
Elemental pAnalysis p- pAnswer p- p p pA pmethod pof pobtaining pEmpirical pFormulas pfor punknown
pcompounds p(containing pC pand pH) pby pburning pa psample pof pthe pcompound pin ppure poxygen pand
panalyzing pthe pproducts pof pthe pcombustion preaction.
What pmust pbe pin pequilibrium pin pa p"balanced" pchemical preaction? p- pAnswer p- p p p1.) pThe
pnumber pof patoms
, 2.) pThe pamount pof pmass
Organic pCompounds p- pAnswer p- p p pA pcompound pcomposed pof pC pand pH pand pother pelements: pN,
pO, pand pS.
Example: pMethane p(CH4)
Hydrocarbons p- pAnswer p- p p pOrganic pCompounds pcomposed pof ponly pC pand pH.
Alkanes, pAlkenes, pAlkynes p(# pof pbonds)? p- pAnswer p- p p pAlkanes p=> p
pHydrocarbons pwith psingle-bonded pcarbons
Alkenes p=> p
pHydrocarbons pwith pdouble-bonded pcarbons
Alkynes p=> p
pHydrocarbons pwith ptriple-bonded pcarbons
Base pNames pfor pHydrocarbons p- pAnswer p- p p pmeth p= p1
eth p= p2
prop p= p3
but p= p4
pent p= p5
hex p= p6
hept p= p7
oct p= p8
non p= p9
dec p= p10
The pGreenhouse pEffect p- pAnswer p- p p pGreenhouse pgases pin pthe patmosphere pact pas pa pone-way
pfilter.
solution verified 100% correct
How pto pfind pthe pmass pof pa pmolecule? p- pAnswer p- p p pg pmolecule p--> pmol pmolecule p-->
pAvogadro's p#
Example:
(1 pmol pCO2 p/ p44.01g pCO2) p
xp
(6.022 px p10^23 pCO2 pmolecules p/ p1 pmol pCO2)
OR p(to porganize pthe pequation/steps)
(44.01g pCO2 p/ p1 pmol pCO2)
x
(1 pmol pCO2 p/ p6.022 px p10^23 pCO2 pmolecules)
Mass pPercent pComposition p
(Mass pPercent) p- pAnswer p- p p p(Mass pof pelement pX pin p1 pmol pof pcompound p/
Mass pof p1 pmol pof pthe pcompound) px p100%
Example:
,(2 px pmolar pmass pCl p/ pmolar pmass pCCl2F2) px p100%
How pto pcalculate pthe pnumber pof pmoles pof peach pelement pthat pare ppresent pin peach psample? p-
pAnswer p- p p pExample:
0.857g pH px p(1 pmol pH p/ p1.01 pg pH) p= p0.849 pmol pH
6.86g pO px p(1 pmol pO p/ p16.00g pO) p= p0.429 pmol pO
[Divide peach p# pof pmoles pby pfewest pmoles]
0.849 pmol pH p/ p0.429 p= p1.98 p=> p2 p
0.429 pmol pO p/ p0.429 p= p1
So, pthe pempirical pcompound pof pHydrogen pand pOxygen pis pH2O
How pto pcalculate pMolecular pMass p[n] p
(After pfinding pEmpirical pFormula pand pgiven pMolar pMass pin pthe pproblem)? p- pAnswer p- p p
pMolecular pMass p[n] p=> p
(molar pmass p/ pempirical pformula pmolar pmass)
Elemental pAnalysis p- pAnswer p- p p pA pmethod pof pobtaining pEmpirical pFormulas pfor punknown
pcompounds p(containing pC pand pH) pby pburning pa psample pof pthe pcompound pin ppure poxygen pand
panalyzing pthe pproducts pof pthe pcombustion preaction.
What pmust pbe pin pequilibrium pin pa p"balanced" pchemical preaction? p- pAnswer p- p p p1.) pThe
pnumber pof patoms
, 2.) pThe pamount pof pmass
Organic pCompounds p- pAnswer p- p p pA pcompound pcomposed pof pC pand pH pand pother pelements: pN,
pO, pand pS.
Example: pMethane p(CH4)
Hydrocarbons p- pAnswer p- p p pOrganic pCompounds pcomposed pof ponly pC pand pH.
Alkanes, pAlkenes, pAlkynes p(# pof pbonds)? p- pAnswer p- p p pAlkanes p=> p
pHydrocarbons pwith psingle-bonded pcarbons
Alkenes p=> p
pHydrocarbons pwith pdouble-bonded pcarbons
Alkynes p=> p
pHydrocarbons pwith ptriple-bonded pcarbons
Base pNames pfor pHydrocarbons p- pAnswer p- p p pmeth p= p1
eth p= p2
prop p= p3
but p= p4
pent p= p5
hex p= p6
hept p= p7
oct p= p8
non p= p9
dec p= p10
The pGreenhouse pEffect p- pAnswer p- p p pGreenhouse pgases pin pthe patmosphere pact pas pa pone-way
pfilter.
