6.69 g.
<h3>Explanation</h3>
Make sure the chemical equation is balanced:

Assuming that one mole of N₂ is consumed. How many grams of each reactant will that take? Refer to a periodic table for data on atomic mass.
- 6 × 6.94 = 41.64 grams of Li;
- 1 × (2 × 14.01) = 28.02 grams of N₂.
4.00 grams of each reactant are available. How many moles of N₂ can they consume?
- 4.00 grams of Li will lead to up to 4.00 / 41.64 = 0.09606 moles of the reaction.
- 4.00 grams of N₂ will lead to up to 4.00 / 28.02 = 0.1428 moles of the reaction.
However, only 0.09606 moles of the reaction is possible, since Li would have ran out before all 4.00 grams of N₂ are used up.
Each mole of the reaction makes 2 moles of Li₃N. 0.09606 moles of the reaction will produce 0.09606 × 2 × (3 × 6.94 + 14.01) = 6.69 grams of Li₃N.
A redox reaction be used as a source of electrical energy only when two half-reactions are physically separated. <span>The electrons that are released at the anode flow through the wire, producing an electric current. Galvanic cells therefore transform chemical energy into electrical energy that can then be used to do work.</span>
It was discovered in 1868.i hope this helps you .