Gen Chem Question

[Sublimation]

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if all of the chloride in a 5.0 gram sample of an unknown metal chloride is precipitated as AgCl with 70.9 mL if .201 M AgNO3, what is the percentage of chloride in the sample?

Can someone show me how to approach this. THANKS

 

[ttran9229]

if all of the chloride in a 5.0 gram sample of an unknown metal chloride is precipitated as AgCl with 70.9 mL if .201 M AgNO3, what is the percentage of chloride in the sample?

Can someone show me how to approach this. THANKS

First, you need to determine how many moles of AgNO3 is used:

(0.0709)(0.201)

Since there is a 1:1 mole ratio of Ag to Cl, then the number of moles of Cl in the compound is also (0.0709)(0.201). Next, convert moles of Cl to gram weight:

(0.0709)(0.201)(35.5)

So, the percent of Cl in the sample should be:

[(0.0709)(0.201)(35.5)/5] * 100%

 

[Sublimation]

Thats how i did it. ok good...i thought i did it wrong or something....the book must be wrong then...its barrons. THANKS FOR UR HELP.

 

[ttran9229]

Thats how i did it. ok good...i thought i did it wrong or something....the book must be wrong then...its barrons. THANKS FOR UR HELP.

I reviewed the Barron's book and it seems to me that the person who developed the questions and answer key was taking some major drugs. Whatever they're taking, I can sure use some to cope with the DAT stress.