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Oxidation is just another word for combustion (burning) since combustion involves a substance reacting with oxygen to form carbon dioxide and water vapor. To solve part b of L.7, use dimensional analysis like you did for part a. However, instead of for every 2 mol of fat, there are 110 mol of H2O, put for every 2 mol of fat, there are 163 mol of O2. Then multiply by the molar mass of O2 to get the mass of oxygen needed to oxidize this amount of tristearin.
The previous reply is right; in this problem, all you need to know about oxidation is that it occurs during combustion. If you want to understand what oxidation is though, it is what happens when an atom loses some of its electrons during a chemical reaction. Oxygen has a high electronegativity, so when it reacts with other elements, it generally takes some of their electrons, and that's why we say "oxidized" or "oxidation."
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