Question

Limiting Reactant:

If 11.5 g of zinc reacts with 9.55 g of nitrogen gas how many grams of zinc nitride will be
produced? Identify the limiting and excess reactants.
3 Zn + N2 + Zn3N2
Theoretical Yield:
Limiting Reactant:
Excess Reactant:

Answer 1

Zn as a limiting reactant

N₂ as an excess reactant

Theoretical Yield : 13.15 g

Further explanation

Reaction

3 Zn + N₂ ⇒ Zn₃N₂

Ar Zn : 65,38 g/mol

Ar N₂ : 28.0134 g/mol

mol Zn

`\tt (11.5)/(65.38)=0.176`

mol N₂

`\tt (9.55)/(28.0134)=0.341`

limiting reactant : the smaller ratio(mol:coefficient)

mol ratio Zn : N₂ :

`\tt (0.176)/(3)/ (0341)/(1)=0.0586/ 0.341`

Zn as a limiting reactant(smaller ratio)

N₂ as an excess reactant

mol Zn₃N₂ :

`\tt (1)/(3)* 0.176=0.0586`

mass of Zn₃N₂ (Theoretical Yield) :

`\tt 0.0586* 224.154~g/mol=13.15~g`