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September 30, 2014

Homework Help: Chemistry. Percent mass...

Posted by Sarah on Friday, November 21, 2008 at 7:37pm.

A 1.009 g mixture of the solid salts Na2SO4 (molar mass= 142.04) an Pb(No3)2 (molar mass= 331.20) form an aqueous solution with the precipitation of PbSO4 (molar mass= 303.26). The precipitate was filtered and dried and its was was found to be .471 g. The limiting reagent is Na2SO4.

How many moles and grams of Na2SO4 are in the reaction?

I found this answer to be .22 g or 1.55 x 10-3 mol.

How many moles and grams of Pb(NO3)2 reacted in the mixture?

I found this answer to be .514 g or 1.55 x 10-3 mol.

What is the percent by mass of each salt in the mixture?

I am confused on this part....


If you could check the answers that I gave, and help with the last part I would REALLY REALLY appreciate it! Thank you very much!

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