3. which is true about the combustion of carbon?
o carbon is produced from oxygen and carbon dioxide.
the reaction is spontaneous.
o enthalpy remains constant.
entropy decreases.

Entropy decreases

Explanation:

Entropy is the tendency of a system to proceed towards disorder. Combustion of carbon results in more order because the carbon combines with oxygen to form carbon monoxide or carbon dioxide. Therefore, the entropy decreases. When carbon is combusted, its enthalpy increases hence the reaction cannot be spontaneous.

if you're asking what comes out, it's steam.

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