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Question

Al(s)+O2(g)Al2O3(s)
The above reaction is balanced so that its coefficients are the lowest whole-number. Find the coefficient of O2.

  1. 4
  2. 6
  3. 2
  4. 3
  5. 1

A
3
B
6
C
4
D
2
E
1
Solution
Verified by Toppr

The unbalanced chemical reaction is Al(s)+O2(g)Al2O3(s)
Balance Al atoms by adding 2 to Al on LHS
2Al(s)+O2(g)Al2O3(s)
Balance O atoms by adding 32 to O2 on LHS
2Al(s)+32O2(g)Al2O3(s)
Multiply the whole equation with 2.
4Al(s)+3O2(g)2Al2O3(s)
This is the balanced chemical equation. The coefficient of O2 is 3.

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