We can use the following equation to solve for **ΔH˚ _{rxn}**:

$\overline{){\mathbf{\Delta H}}{{\mathbf{\xb0}}}_{{\mathbf{rxn}}}{\mathbf{=}}{\mathbf{\Delta H}}{{\mathbf{\xb0}}}_{\mathbf{f}\mathbf{,}\mathbf{}\mathbf{prod}}{\mathbf{-}}{\mathbf{\Delta H}}{{\mathbf{\xb0}}}_{\mathbf{f}\mathbf{,}\mathbf{}\mathbf{react}}}$

Note that we need to *multiply each ΔH˚ _{f} by the stoichiometric coefficient* since ΔH˚

Also, note that ΔH˚_{f} for elements in their standard state is 0.

What is ΔH°rxn for the following chemical reaction?

CO_{2}(g) + 2 KOH (s) → H_{2}O(g) + K_{2}CO_{3}(s)

You can use the following table of standard heats of formation (ΔH°f) to calculate the enthalpy of the given reaction

Express the standard enthalpy of reaction to three significant figures and include the appropriate units

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