79.4k views
2 votes
Which equation is balanced?

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

2 Answers

7 votes
2Na + F2 = 2NaF “this one is balanced”
User Chameera Ashanth
by
7.3k points
0 votes

Answer:

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.

User Joshua Davies
by
6.9k points