The standard enthalpy change for the reaction CaCO3 (s) \rightarrow CaO (s) + CO2 (g) is 178.1...
Question:
The standard enthalpy change for the reaction CaCO3 (s) {eq}\rightarrow {/eq} CaO (s) + CO2 (g) is 178.1 KJ. Calculate the standard enthalpy of formation of CaCO3 (S).
Hess's Law:
The enthalpy change of a chemical reaction {eq}\Delta H {/eq}, is an important thermodynamic parameter that tells you the heat change that occurs at a particular set of constant pressure and temperature conditions. These conditions are most commonly the thermodynamic standard state at 25 Celsius and 1 atm. The enthalpy change is a state function, which allows you to calculate it from known enthalpy changes of chemically-related reactions. This is known as Hess's Law and a common application of the law is the calculation of a standard reaction enthalpy from the standard formation enthalpies of its reaction species.
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The balanced reaction equation is:
{eq}CaCO_3 (s) \rightarrow CaO (s) + CO_2 (g) \\ \Delta H^\circ = 178.1 \ kJ/mol {/eq}
It is assumed that...
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Hess's Law | Definition, Diagram & Equation
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Chapter 16 / Lesson 5
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Learn about Hess's law, statement, equations, and rules. See Hess's law diagram/cycle and the example of how to use Hess's law to find enthalpy changes.
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