Posted by Anonymous on Friday, September 18, 2009 at 7:37pm.
Pb(NO3)2 + 2NaI ==> PbI2 + 2NaNO3
Convert 0.083 g Pb(NO3)2 to moles. #moles = grams/molar mass
Convert moles Pb(NO3)2 to moles PbI2 using the coefficients in the balanced equation which I wrote.
Convert moles PbI2 to grams. grams = moles x molar mass.
the 0.300g is not needed?
Yes, it IS needed but I overlooked it. However, there are 0.002 moles of NaI which is more than enough to react with all of the Pb(NO3)2 (0.00025 moles); therefore, the Pb(NO3)2 is the limiting reagent and the problem is worked exactly as I showed it. That is, the PbI2 formed will be the result of the 0.00025 moles (0.083 g) Pb(NO3)2.
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