Molecular weight of lead(ii) nitrate Pb(NO_3)_2

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The discussion centers around a discrepancy in the molecular weight calculation of Pb(NO3)2 from the book "Analytical Chemistry" by Gard D. Christian. The user calculates the molecular weight as 331.2 g/mol, while the book states it as 283.2 g/mol. Other participants agree with the user's calculation, suggesting that the book contains an error. The incorrect molar mass appears to be off by 48 g/mol, indicating a possible miscalculation as if the formula PbN2O3 was used instead. The conversation raises concerns about the reliability of the book and similar online resources that provide the same erroneous solution.
Paul Black
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Hello everyone
I am trying to solve the following question from the book Analytical Chemistry 7th edition by Gard D. Christian - Page 164 Example 5.17
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My problem is when I calculate the molecular weight of Pb(NO_3)_2 I get 331.2 g/mol but in the book they get 283.2 g/mol . Could you explain to me where they get this number. So instead of getting 0.137 g as last result, I get 0.16 g.

Also googling the question always gets me the same solution.
 
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Paul Black said:
when I calculate the molecular weight of Pb(NO_3)_2 I get 331.2 g/mol

That's what I got as well, book is wrong.
 
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First time I see an error in a book.
So in that case all the internet pages that have the same question+solution made the same mistake. Do they just copy past ?
 
Paul Black said:
First time I see an error in a book.

Lucky you.

So in that case all the internet pages that have the same question+solution made the same mistake. Do they just copy past ?

Apparently.

The molar mass they used is off by 48, which is exactly three oxygen atoms, as if they had calculated molar mass for PbN2O3.
 
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Thank you for your help
Will see if this book has more mistakes.
 

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