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.

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products