Two moles of magnesium (Mg) and five moles of oxygen (O2) are placed in a reaction vessel. When magnesium is ignited, it reacts
with oxygen. What is the limiting reactant in this experiment?
Mg + O2 → MgO (unbalanced)
A.
Mg
B.
O2
C.
MgO
D.
both the reactants are in same proportion
1 answer:
Answer:

Explanation:
We are given the amounts of two reactants, so this is a limiting reactant problem.
We know that we will need moles, so, lets assemble the data in one place.
2Mg + O₂ ⟶ 2MgO
n/mol: 2 5
Calculate the moles of MgO we can obtain from each reactant.
From Mg:
The molar ratio of MgO:Mg is 2:2

From O₂:
The molar ratio of MgO:O₂ is 2:1.

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