Based on the information for two different reactions given above, (−ΔH1)+ΔH2 of the following gives the quantities needed to calculate the enthalpy change for the reaction represented by the overall equation.
The term "enthalpy change" refers to the quantity of heat released or absorbed during a reaction that takes place under a constant amount of pressure. It has the sign H, which can be interpreted as "delta H." Enthalpy changes that are considered standard occur when all the components are present and the conditions are standard. Referred to as "reference states," standard states are sometimes.
One set of chemical substances can change into another through a process known as a chemical reaction. A chemical change often characterises chemical reactions, and they produce one or more products that typically have characteristics distinct from the reactants.
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