Question

Which equation is balanced?

O Mg + O2 + 2Mgo
O2A1+F2 + 2A1F3
O2A1+302 A1,03
O2Na+ F2 + 2NaF

Answer 1

2Na + F2 = 2NaF “this one is balanced”

Answer 2

D)
`2Na+F_2>2NaF` is a balanced chemical equation.

Step-by-step explanation:

A)

`Mg+O_2>2MgO` is Unbalanced

The balanced chemical equation will be
`2Mg+O_2>2MgO`

B)

`2Al+F_2>2A1F_3` is Unbalanced

The balanced chemical equation will be
`2Al+3F_2>2A1F_3`

C)

`2Al+3O_2>AlO_3` is Unbalanced

The balanced chemical equation will be
`2Al+3O_2>2AlO_3`

D)

`2Na+F_2>2NaF` is a balanced chemical equation

Balancing is making the number of atoms of each element same on both the sides (reactant and product side).

To find the number of atoms of each element we multiply coefficient and the subscript

For example

5
`Ca_1 Cl_2` contains

5 × 1 = 5 ,Ca atoms and

5 × 2 = 10, Cl atoms

If there is a bracket in the chemical formula

For example
`3Ca_3 (P_1 O_4 )_2` we multiply coefficient × subscript × number outside the bracket to find the number of atoms

(Please note: 3 is the coefficient, and if there is no number given then 1 will be the coefficient )

So

3 × 3 = 9 , Ca atoms

3 × 1 × 2 = 6, P atoms

3 × 4 × 2 = 24, O atoms are present.