D. 2Na (s) + MgF2 → 2NaF (s) + Mg (s)
Explanation:
From the given choices, 2Na (s) + MgF2 → 2NaF (s) + Mg (s) is balanced
A balanced equation is one that obeys the law of conservation of matter which states that "matter is neither created nor destroyed but transformed from one form to another".
We expect to find the same name of atoms on both sides of the equation.
let us examine the choices;
Zn (s) + HCl (g) → ZnCl2 (s) + H2 (g)
Reactants Products
Zn 1 1
H 1 2
Cl 1 2
Na (s) + O2 (g) → Na2O
Reactants products
Na 1 2
O 2 1
Na (s) + MgF2 → 2NaF (s) + Mg (s)
Reactants products
Na 1 2
Mg 1 1
F 2 2
2Na (s) + MgF2 → 2NaF (s) + Mg (s)
Reactants products
Na 2 2
Mg 1 1
F 2 2
learn more:
Balanced equation brainly.com/question/2947744
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