Test Bank for General chemistry the essential concepts 17th edition by Raymond Chang and Goldsby Chapters 1-22 Covered

Test Bank for General Chemistry 10th
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Edition by Darrell Ebbing, Steven D.
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Gammon
SAMPLE

Chapter 3 – Calculations with Chemical Formulas and Equations
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Chapter 3 – Calculations with Chemical Formulas and Equations
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1.bThebmolecularbformulabofbabparticularbsolidbisbC8H6O8.bItsbmolecularbmassbisb

A)b352bamu.

B)118bamu.

C)b364bamu.b

D)b230bamu.b

E)b226bamu.

ANS:bDb

PTS:b1bDIF:beasybREF:b3.1OBJ:bCalculatebthebformulabmassbfrombabformula.b(Example

3.1)bTOP:bstoichiometryb|bmassbandbmolesbofbsubstancebKEY:bmolecularbmassbMSC:bgeneral

chemistry

2.bThebhydrocarbonbheptanebhasbthebstructuralbformulabCH3(CH2)5CH3.bWhatbisbthebmolecular

massbofbthisbhydrocarbon?b

A)b100.2bamu.

B)b0.009980bamu.

C)b86.17bamu.

D)b0.01160bamu.

E)b110.2bbamu.

,ANS:bAbPTS:b1b

DIF:beasybREF:b3.1OBJ:bCalculatebthebformulabmassbfrombabformula.bTOP:

Stoichiometryb|bmassbandbmolesbofbsubstance

3.bAbsinglebmoleculebofbpolystyrenebhasbthebrepeatingbunitb-[CH2CH(C6H5)]n-,bwherebnbisbthe

numberbofbrepeatingbunits.bWhatbisbthebvaluebofbnbifbthebmolecularbmassbofbabsinglebpolymer

Chainbisbamu?b

A)bUnits.b

B)bUnits.b

C)bUnits.b

D)bUnits.b

E)bUnits.

ANS:bAbPTS:b1b

DIF:bmoderatebREF:b3.1OBJ:bCalculatebthebformulabmassbfrombabformula.bTOP:

Stoichiometryb|bmassbandbmolesbofbsubstanceb

Thebformulabmassbofbaluminumboxalate,bAl2(C2O4)3,bisb

A)b140bamu.

B)b318bamu.

C)b283amu.

D)b213bamu.

E)b185bamu.

ANS:bBbPTS:b

1bDIF:beasybREF:b3.1OBJ:bCalculatebthebformulabmassbfrombabformula.b(Example

3.1)bTOP:bstoichiometryb|bmassbandbmolesbofbsubstancebKEY:bformulabmass

MSC:bgeneralbchemistry

5.bThebformulabmassbofbzincbacetatebtrihydrate,bZn(CH3COO)2b•b3H2O,bis

, A)b321bamu.

B)b184amu.

C)b268bamu.

D)b238bamu.

E)b114bamu.

ANS:bDbPTS:b1b

DIF:beasybREF:b3.1OBJ:bCalculatebthebformulabmassbfrombabformula.b(Example

3.1)bTOP:bstoichiometryb|bmassbandbmolesbofbsubstancebKEY:bformulabmassbMSC:bgeneral

chemistry

6.bThebfullybhydratedbformbofbsodiumbsulfatebisbthebdecahydrate,bNa2SO4b•b10H2O.bWhen

heatedbthebhydratedbsaltblosesbwater.bHowbmanybwaterbmoleculesbarebfoundbperbformulabunitbinba

partiallybdehydratedbsamplebofbsodiumbsulfatebwithbabformulabmassbofb160.1bamub(i.e.bfindbn

forbNa2SO4b•bnH2O)?

A)b1bwaters.

B)b5bwaters.

C)b3bwaters.

D)b4bwaters.

E)b7bwaters.

ANS:bAbPTS:b1b

DIF:bmoderatebREF:b3.1OBJ:bCalculatebthebformulabmassbfrombabformula.bTOP:

Stoichiometryb|bmassbandbmolesbofbsubstance

7.bWhatbisbthebmolecularbmassbofbcycloheptane,bC7H14?

A)b13.02bamu

B)b1191.19bamu

C)b85.08amu