A chemistry student carries out this reaction, beginning with 2.10 grams of NaBr and 3.25 grams of Pb(NO3)2: (First, balance the reaction if needed) NaBr (aq) + Pb (NO3)2 (aq) →PbBr2 (s) + NaNO3 (aq)Which starting material is the limiting reagent? What is the theoretical yield of PbBr2, in this reaction? If the student actually isolates 3.5 g of PbBr2, what is the percent yield of the reaction?

Initially, mass of NaBr = 2.10g Mass of Pb(NO3)2 = 3.25g The balanced chemical…

Answered: A chemistry student carries out this…

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter4: Stoichiometry

Section: Chapter Questions

Problem 4.68PAE: 4.68 The pictures below show a molecular-scale view of a chemical reaction between the compounds AB2...

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A chemistry student carries out this reaction, beginning with 2.10 grams of NaBr and 3.25 grams of Pb(NO3)2: (First, balance the reaction if needed)

NaBr (aq) + Pb (NO3)2 (aq) →PbBr2 (s) + NaNO3 (aq)

Which starting material is the limiting reagent?
What is the theoretical yield of PbBr2, in this reaction?
If the student actually isolates 3.5 g of PbBr2, what is the percent yield of the reaction?

Expert Solution

Step 1

Initially,

mass of NaBr = 2.10g

Mass of Pb(NO₃)₂ = 3.25g

The balanced chemical equation is

2NaBr (aq) + Pb(NO₃)₂ (aq) $\to$ PbBr₂ (s)+ 2NaNO₃(aq)

from the above balanced equation it is clear that,

2 mole of NaBr require 1 mole of Pb(NO₃)₂

now finding their no of moles:

$n o o f m o l e s o f N a B r = \frac{g i v e n m a s s o f N a B r}{m o l a r m a s s} = \frac{2.10}{102.894} = 0.0204 m o l e n o o f m o l e s o f P b {(N O_{3})}_{2} = \frac{g i v e n m a s s o f P b (N O_{3})}{m o l a r m a s s} = \frac{3.25}{331.2} = 0.0098 m o l e a s f r o m e q u a t i o n, 1 m o l e o f P b {(N O_{3})}_{2} r e q u i r e 1 m o l e o f N a B r t h e r e f o r e, 0.0098 m o l e o f P b {(N O_{3})}_{2} r e q u i r e 0.0196 m o l e o f N a B r s o, N a B r i s i n e x c e s s a m o u n t H E N C E, P b {(N O_{3})}_{2} i s l i m i t i n g r e a g e n t$

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