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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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buffyl13 buffyl13
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12 years ago
how many grams of lithium nitride are obtained?  (assuming one reactant will not be entirely used up)

In the very least, I just need to know how to solve this problem and what equations to use etc.  Thanks.
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#1
12 years ago
the first step is to write the complete balanced equation:

6Li + N2 ---> 2Li3N

now do some stoichiometry to determine which is the limiting reactant.  find moles of Li and N2 from the grams given and their molar masses.  then multiply each of those by the mole ratio.  whichever one is smallest will be the theoretical yeild.  also that reactant will be your limiting.  since the rxn only had 50% yield, multiply your theoretical yield by 0.50 and then convert back to grams using the molar mass of lithium nitride.
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