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:

Zn as a limiting reactant

N₂ as an excess reactant

Theoretical Yield : 13.15 g

Reaction

3 Zn + N₂ ⇒ Zn₃N₂

Ar Zn : 65,38 g/mol

Ar N₂ : 28.0134 g/mol

mol Zn

mol N₂

limiting reactant : the smaller ratio(mol:coefficient)

mol ratio Zn : N₂ :

Zn as a limiting reactant(smaller ratio)

N₂ as an excess reactant

mol Zn₃N₂ :

mass of Zn₃N₂ (Theoretical Yield) :

a galvanic cell( aka voltaic cell) and electrolytic cell

explanation:

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answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.