When 100 g #Mg_3N_2# reacts with 75.0 g #H_2O#, what is the limiting reactant?
1 Answer
The salt REQUIRES SIX EQUIV of water....and the water is the limiting reactant....
Explanation:
As always, our priority is to write a stoichiometrically balanced equation to represent the reaction....
I subscripted the masses of reactants and product to establish that the equation was stoichiometrically kosher. Garbage out EQUALS garbage in, as is absolutely required.
And so ...........
And so here UNUSUALLY the water is in stoichiometric deficiency. And it is unusual in that in these circumstances it is hard to exclude water from a reaction setup. The nitride may be incompletely reduced to give say hydrazine or some other product.