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Those are combustion equations. The combustion of a hydrocarbon is: the hydrocarbon + oxygen = water + carbon dioxide. The combustion of just hydrogen is hydrogen + oxygen = water. So you write those combustion equations and balance them by putting the right coefficients in front of each molecule.
In this problem, they give you the enthalpy for the combustion of three different compounds. In combustion, you know that the compound will react with oxygen to produce carbon dioxide and water vapor. Once you balance them, this is how you get the three equations. From there, you can use Hess's Law to solve the problem. Hope this helps!
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