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02-29-2008, 07:19 PM
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| chemistry question? Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li (s) + N2 (g) -> 2Li3N (s) In a particular experiment, 3.50-g samples of each reagent are reacted. The theoretical yield of lithium nitride is __________ g.      |
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02-29-2008, 07:21 PM
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| Atomic weights: Li=6.9 N=14 N2=28 Li3N=34.8 3.50gLi x 1molLi/6.9gLi = 0.507 mole Li 3.50gN2 x 1molN2/28gN2 = 0.125 mole N2 0.125 mole N2 needs (6)(0.125) = 0.75 mole Li, and you don't have that much. So Li is the limiting reagent. 0.507molLi x 2molLi3N/6molLi x 34.8gLi3N/1molLi3N = 5.88g Li3N theoretical |
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