1. Complete and balance the following
reaction equations.
(a) Al + H2O
(steam)
(b) Al + O2 →
Answers
Answer:
Al+H2o= Al2o3+H2o
Al+O2=Alo3
Answer:
Al+H
2
O→Al(OH)
3
+H
2
To do:
Balance the given reaction
Solution:
The given reaction is Al+H_2O\rightarrow Al(OH)_3+H_2Al+H
2
O→Al(OH)
3
+H
2
. For this reaction the number of atoms in the:
Reactant side
Al = 1
H = 2
O = 1
Product side
Al = 2
O = 3
H = 5
As the number of atoms in the reactant as well as product side is not equal, the given equation is not a balanced one.
To balance it certain changes must be made. The given equation with some alteration gives:
2Al+6H_2O\rightarrow2Al(OH)_3+3H_22Al+6H
2
O→2Al(OH)
3
+3H
2
When the number of atoms in the above reaction is calculated, it gives:
Reactant side:
Al = 2
H = 12
O = 6
Product side:
Al = 2
H = 12
O = 6
Thus both the reactants as well as product contains equal number of atoms, the above-given reaction is a balanced reaction.
Conclusion:
Unbalanced equation: Al+H_2O\rightarrow Al(OH)_3+H_2Al+H
2
O→Al(OH)
3
+H
2
Balanced equation: 2Al+6H_2O\rightarrow2Al(OH)_3+3H_22Al+6H
2
O→2Al(OH)
3
+3H
2
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