calculating the enthalpy change of reaction This page explains hess's law, and uses it to do some simple enthalpy change calculations involving enthalpy changes of reaction, formation and combustion hess's law stating hess's law hess's law is the most important law in this part of chemistry most calculations follow from it it says  .
{"Image DocumentName": "Calculating Standard Enthalpy Change for a Reaction", "Image ImageDescription": "Any reaction can be written as the sum of formation reactions (or the reverse of formation reactions) for the reactants and products. The DH\u00b0 for the reaction is then the sum of the DHf\u00b0 for the component reactions. DH\u00b0reaction = S n DHf\u00b0(products) \u2013 S n DHf\u00b0(reactants) S means sum. n is the coefficient of the reaction.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}