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in this video were going to focus on thermochemical equations so what exactly is a thermochemical equation its a chemical equation that relates the amount of thermal heat that can be absorbed or released so what you need to understand is the relationship between the coefficient and this number so for example if four moles of iron metal reacts in its reaction negative 1652 kilojoules of heat energy will be released if three moles of oxygen gas is consumed in this reaction the same amount of heat energy will be released and if two moles of iron iii oxide is produced in this reaction the same amount of heat energy will be released so you need to understand the relationship between this amount of thermal energy and the moles of the reactants and products so now lets focus on this problem iron metal reacts with oxygen gas to produce iron iii oxide according to the reaction shown below how much heat is released when 9 moles of fe reacts with excess oxygen gas so lets start with what we
