3.1.4.3 Applications Of Hess's Law
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What is Hess’s Law?
The enthalpy change for a given reaction is independent of the route by which the reaction is achieved
What is the symbol for enthalpy change?
🔼Hr = enthalpy change 🔼Hr = 🔼H1 + 🔼H2
What are the symbols for endothermic and exothermic reactions?
-Ve = exothermic \+Ve = endothermic
What are the units for enthalpy change?
Kilojoules per mole
What is the enthalpy change of formation?
Arrows point upwards Reactants to products on top row Elements in their standard state on bottom row 🔼Hr = 🔼Hf (products) -🔼Hf (reactants)
What is the enthalpy change of combustion?
Arrows point down Reactants to products on top row Combustion products on bottom row 🔼Hr = +🔼Hc (reactants) - 🔼Hc (products) Multiply 🔼Hf / 🔼Hc by the number of moles in the equation
How do you use bond enthalpies to determine enthalpy change?
🔼Hr = positive bond enthalpies (reactants) + negative bond enthalpies (products)
How do you work out the enthalpy change in a reaction when given bond enthalpies?
• Draw the structure of the reaction • Total the number of bonds • Input the values of bonds • (Bond enthalpies of reactants) - (Bond enthalpies of products)