theDr.

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I remember this from chemistry -- but it wasn't cover in EK...isn't there a wt/vol ratio also -- are these in the kaplan books - thanks
 

Cerberus

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theDr. said:
I remember this from chemistry -- but it wasn't cover in EK...isn't there a wt/vol ratio also -- are these in the kaplan books - thanks
what does it sound like...
 

blz

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wt-wt % just means that whatever solute you're dissolving is x% of the total weight of the solution. So for that problem, you assume 10grams of solution of which 10% (1 gram) is Pb(NO3)2. The rest (9grams) would be water. Then you just use the standard mole fraction eqn to find it using those values. I believe it works out to .006
 
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