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In-s [12.5K]
2 years ago
12

Balance the combustion reaction between octane and oxygen. 2C8H18 + O2 → CO2 + H2O

Chemistry
2 answers:
Ber [7]2 years ago
6 0

Explanation:

A balanced reaction is a reaction where there are equal number of atoms on both reactant and product side.

For example, 2C_{8}H_{18} + O_{2} \rightarrow CO_{2} + H_{2}O

Number of atoms on reactant side are as follows.

  • C = 16
  • H = 36
  • O = 2

Number of atoms on product side are as follows.

  • C = 1
  • H = 2
  • O = 3

Therefore, in order to balance the equation we multiply O_{2} by 25 on reactant side and multiply CO_{2} by 16 and H_{2}O by 18.

Thus, the balanced chemical equation will be as follows.

       2C_{8}H_{18} + 25O_{2} \rightarrow 16CO_{2} + 18H_{2}O

nika2105 [10]2 years ago
5 0
The answer is 2C8H18 + 25O2 ⇒ 16CO2 + 18H2O<span />
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Write the balanced chemical equation for the following reaction. Phases are optional. Solid calcium chlorate decomposes to form
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Answer:

  • Ca(ClO₃)₂ (s) → CaCl₂ (s) + 3O₂ (g)

Explanation:

1)<u> Word equation (given)</u>

  • <em>calcium chlorate (solid) → solid calcium chloride (solid)  + oxygen (gas)</em>

2) <u>Chemical formulae of the reactant and products</u>:

  • <em><u>Calcium chlorate</u></em><em>: </em>

The most common oxidation states of chlorine are -1, +1, +3, +5, +7.

The suffix ate in chlorate means that chlorine atom is with the third lowest oxidation state (counting only the positive states). So, this is +5.

The oxidation state of calcium is +2.

Hence, the chemical formula of calcium chlorate is Ca(ClO₃)₂

  • <u><em>Calcium chloride</em></u>

The suffix ide in chloride means that chlorine is with oxidation state -1. Again the oxidation state of calcium is +2.

Hence, the chemical formula of calcium chloride is CaCl₂

  • <u><em>Oxygen</em></u>

Oxygen gas is a diatomic molecule, so its chemical formula is O₂.

  • <u><em>Phases</em></u>

The symbols s and g (in parenthesis) indicate the solid and gas phases respectively.

3) <u>Chemical equation</u>:

  • Ca(ClO₃)₂ (s) → CaCl₂ (s) + O₂ (g)

That equation is not balanced becasue the number of O atoms in the reactant side and in the product side are different.

4)<u> Balanced chemical equation:</u>

Add a 3 as coefficient in front of O₂(g), in the product side to balance:

  • Ca(ClO₃)₂ (s) → CaCl₂ (s) + 3O₂ (g)

Verify that all the atoms are balanced:

Atom    Reactant side      Product side

Ca             1                           1

Cl              2                          2

O              3×2 = 6                2×3 = 6

Conclusion: the equation is balanced and the final answer is:

  • Ca(ClO₃)₂ (s) → CaCl₂ (s) + 3O₂ (g)
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