Christopher Hren is a high school chemistry teacher and former track and football coach. Step 1: Balance the given chemical equation. Many reactions are reversible, meaning that the product(s) of the reaction are capable of combining and reforming the reactant(s). Different substances need different amounts of energy to be transferred to them to raise the temperature, and the specific heat capacity of the substance tells you how much that is. The surroundings are everything in the universe that is not part of the system. Enthalpy measures the total energy of a thermodynamic system either in the form of heat or volume multiplied by pressure. Sulfur dioxide gas reacts with oxygen to form sulfur trioxide in an exothermic reaction, according to the following thermochemical equation. Energy absorbed would be a negative number. Enthalpies of Reaction. He is the author of Biochemistry For Dummies and Chemistry For Dummies, 2nd Edition.
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