Limiting Reactant Practice Problems

LimitingReactantPracticeProblems

1) Themorereactivehalogenelementsareabletoreplacethelessreactive

halogensfromtheircompounds.

Cl2(g)+NaI(aq)NaCl(aq)+I2(s)

Supposethatasolutioncontaining25.0gNaIreactswith5.00gofCl2.What

massofiodinewillbeproducedfromthereactionabove?

2)Forthefollowingunbalancedchemicalreaction,supposethatexactly

15.0gofeachreactantisused.Whatisthelimitingreactant?

Al(s)+HCl(aq)AlCl3(aq)+H2(g)

3)Forthefollowingunbalancedchemicalreaction,supposethatexactly

15.0gofeachreactantisused.Whatisthelimitingreactant?

Pb(NO3)2(aq)+HCl(aq)PbCl2(s)+HNO3(aq)

4)Howmuchexcessreactant(fromquestion#3)willbeleftwhenthe

reactioniscomplete?

LimitingReactantPracticeProblems

1) Themorereactivehalogenelementsareabletoreplacethelessreactive

halogensfromtheircompounds.

Cl2(g)+2NaI(aq)2NaCl(aq)+I2(s)

Supposethatasolutioncontaining25.0gNaIreactswith5.00gofCl2.What

massofiodinewillbeproducedfromthereactionabove?

First,determinelimitingreactant;

5.00gCl2 x 1molCl2 x 2molNaI x 150gNaI = 21.1gNaI ,wehaveexcess

1

71gCl2 1molCl2 1molNaI

NaIavailable,sotheCl2isthelimitingreactantandshouldbeusedto

calculatetheamountofI2producedinthisreaction.

5.00gCl2 1

x 1molCl2 71gCl2

x 1molI2 1molCl2

x

254 gI2 1molI2

= 17.9gI2

2)Forthefollowingunbalancedchemicalreaction,supposethatexactly

15.0gofeachreactantisused.Whatisthelimitingreactant?

2Al(s)+6HCl(aq)2AlCl3(aq)+3H2(g)

Startwitheitherreactantandsolveforthemassoftheotherreactant;

15.0gAl x 1molAl x 6molHCl x 36gHCl = 60.0gHCl,wedonothave60.0gof 1 27gAl 2molAl 1molHCl

HClavailable(only15gHCl)toreactwithalloftheAl,soHClisthelimiting

reactant.

3)Forthefollowingunbalancedchemicalreaction,supposethatexactly

15.0gofeachreactantisused.Whatisthelimitingreactant?

Pb(NO3)2(aq)+2HCl(aq)PbCl2(s)+2HNO3(aq)

15.0gPb(NO3)2 x 1molPb(NO3)2 x 2molHCl x 36gHCl = 3.26gHCl ,we

1

331gPb(NO3)2 1molPb(NO3)2 1molHCl

haveplentyofHCltoreactwithall15gofthePb(NO3)2,soPb(NO3)2isthe

limitingreactant.

4)Howmuchexcessreactant(fromquestion#3)willbeleftwhenthe

reactioniscomplete?

SubtracttheamountofHClthatwouldreact(3.26gHCl)andsubtractitfrom

thestartingamountofHCl(15.0g);

15.0g?3.26g=11.74gHClexcess

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