Consider reaction: Al(s) + O₂ (g) → Al₂O₃. Moles of Al(s) needed to balance equation are
(a) 2
(b) 1
(c) 3
(d) 4
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Answers
Answered by
16
Answer:
The unbalanced chemical reaction is Al(s)+O
2
(g)→Al
2
O
3
(s)
Balance Al atoms by adding 2 to Al on LHS
2Al(s)+O
2
(g)→Al
2
O
3
(s)
Balance O atoms by adding
2
3
to O
2
on LHS
2Al(s)+
2
3
O
2
(g)→Al
2
O
3
(s)
Multiply the whole equation with 2.
4Al(s)+3O
2
(g)→2Al
2
O
3
(s)
This is the balanced chemical equation. The coefficient of O
2
is 3.
Answered by
7
(d) 4 moles are needed to balance equation.
- Balanced chemical reaction between aluminium and oxygen is as follows -
- 4Al(s) + 3O₂ (g) → 2Al₂O₃.
- Aluminium oxide finds its application in production of aluminium, manufacturing in industries and pharmaceutical companies.
- It is also used in dental applications and as dessicating agent.
- It is harmful to humans as long inhalation of the compound can result in respiratory disorders.
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