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Objective: To use calorimetry data and the amount of reactant to determine the enthalpy change for a stated reaction and to include the energy term on the proper side of a thermochemical equation.

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Enthalpy Change

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Apprentice Difficulty Level 6 Questions Given ∆H for one equation, write the ∆H for equations with different coefficients and include the energy term in the chemical equation.

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Master Difficulty Level 6 Questions Given moles of reactant used in a calorimetry study and the associated Q value, determine ∆H for the reaction.

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Wizard Difficulty Level 6 Questions Given mass of reactant used in a calorimetry study and the associated Q value, determine ∆H for the reaction.

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Tap field to enter or edit value for ∆H.

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PCl3(g) + Cl2(g) → PCl5(g)

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The ∆H for the following reaction is AAA kJ.

Determine the ∆H (in kJ) for the related reactions below. (Give attention to the +/- sign).

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Use their data to determine the enthalpy change (in kJ) of reactions 1, 2, and 3. Include the proper +/- sign on ∆H. Tap fields to enter or edit a value.

Master

Students are studying the reaction:

∆H =

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Prdt

Tap the Rxt and Prdt buttons to toggle the energy term’s location.

The ∆H values for three chemical equations is shown. Adjust the equation so that the energy term (kJ) is located in the equation. Locate it on either the reactant or the product side.

Wizard

Use their data to determine the moles of reactant and the enthalpy change (in kJ) of the given reaction. Include the proper +/- sign on ∆H. Tap fields to enter or edit a value.