Molar mass of "Li_3N" is 35 gms.
Thus "87.2 grams =87.2\/35 moles" .
1 mole "Li_3N" reacts with 3 moles of Li
Thus Lithium required is "87.2*3\/35 moles"
Atomic mass of Li is 7 gms.
Thus, mass of lithium required is
"87.2*3*7\/35=52.32 gms."
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