The addition of $115.0 \mathrm{~g}$ potassium fluoride to $609.0 \mathrm{~mL}$ of water $(\mathrm{d}=1.00 \mathrm{~g} / \mathrm{mL})$ causes the temperature to rise $3.81 \backslash \operatorname{deg} \mathrm{C}$. What is the $\backslash$ Delta Hrxn for KF? (Assume $\mathrm{cs}=4.18 \mathrm{~J} / \mathrm{g}$ oC.)

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∻Solution∻ ‖ 1 ⋮ **Calculate the heat absorbed by the water**: To find the enthalpy change of the reaction, we first need to calculate the heat absorbed by the water using the formula $q = m \cdot Cs \cdot \Delta T$. ‖ ‖ 2 ⋮ **Convert heat to kilojoules**: The heat absorbed by the water needs to be converted from joules to kilojoules since the enthalpy change is asked in kJ. ‖ ‖ 3 ⋮ **Calculate the enthalpy change for KF**: The enthalpy change for the reaction involving KF is the negative of the heat absorbed by the water per mole of KF. ‖ ∻Answer∻ ⚹ The $\Delta H_{rxn}$ for KF is -57.2 kJ/mol ⚹ ∻Key Concept∻ ⚹ Enthalpy change of a reaction ⚹ ∻Explanation∻ ⚹ The enthalpy change of a reaction is the heat absorbed or released during the reaction, which can be calculated from the temperature change of the solution and the amount of substance involved. ⚹◊What is the formula to calculate the enthalpy change of the reaction (ΔHrxn) in Chemistry?⍭ Generate me a similar question◊

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