What would happen if you passed the products of combustion of a hydrocarbon through lime water?

You will obtain calcium carbonate

Explanation:

First, in the combustion of a hydrocarbon you obtain carbon dioxide and water . We take methane for example:

+ ⇒ +  

And if you pass the products to the lime water, which here it refers to a solution of calcium hydroxide , the following reaction will take place:

+ ⇒ +  

So in the final you obtain a white precipitate, which is the calcium carbonate.

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

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