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Every combustion reaction we deal with produces gas with oxygen in the product, so O2 (oxygen gas) must be a reactant.

For example, methane reacts with Oxygen in this way:

CH4(l) + O2(g) -> C02(g)+2H2(g)

Note O2 in gaseous form as a reactant.

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15y ago
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7y ago

Oxygen is always a reactant in a combustion reaction.

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12y ago

A combustion reaction generally includes a hydrocarbon (some type of fuel) and oxygen

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11y ago

Combustion is burning of of any compound in presence of oxygen. So the reactants will be oxygen and the compound under consideration.

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7y ago

This element is oxygen.

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11y ago

Oxygen

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Q: Which element is always a reactant in a combustion reaction?
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