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Enthalpy

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AP Chemistry

Definition

Enthalpy is a measure of total energy in a thermodynamic system. It includes internal energy which can be used for work and volume expansion against an external pressure.

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Practice Questions (13)

What is the symbol for enthalpy?
When enthalpy is positive, what can be said about the reaction?
When enthalpy is negative, what can be said about the reaction?
In which phase change is enthalpy decreasing?
In which phase change is enthalpy increasing?
What's enthalpy?
Enthalpy is a measure of
Which law helped us understand that enthalpy was a state function (pathway independent)?
Which of the following statements is true about the relationship between entropy and enthalpy in a reaction?
The enthalpy of change for the reaction 2NH3 → N2 + 3H2 is +92 kJ/mol. The enthalpy of change for the reaction 2H2O → 2H2 + O2 is +572 kJ/mol. The enthalpy of change for the reaction N2 + O2 → 2NO is -180 kJ/mol. What is the enthalpy change for the reaction: 4NH3 + 5O2 → 4NO + 6H2O?
The enthalpy of change for the reaction S (s) + O2 (g) → SO2 (g) is -296.0 kJ/mol. The enthalpy of change for the reaction 2SO2 (g) + O2(g) → 2SO3 (g) is -198.2 kJ/mol. What is the enthalpy of change for the reaction S (s) + 3/2 O2 (g) → SO3 (g)?
The enthalpy of change for the reaction H2(g) + 1/2 O2(g) → H2O (g) is -71.2 kJ/mol. The enthalpy of change for the reaction C2H2(g) + 2H2(g) → C2H6(g) is -94.5 kJ/mol. The enthalpy of change for the reaction C2H6(g) + 7/2 O2(g) → 2CO2(g) + 3H2O(g) is -283 kJ/mol. What is the enthalpy of change for the reaction 4CO2(g) + 2H2O(g) → 2C2H2(g) + 5O2(g)?
The enthalpy changes for the formation of aluminum oxide and iron (III) oxide are 2Al(s) + 3/2 O2(g) → Al2O3(s) ΔH° -1676 kJ/mol and 2Fe(s) +3/2 O2(g) → Fe2O3(s) ΔH° -824 kJ/mol. What is the ΔH° for the reaction Fe2O3(s) + 2Al(s) → Al2O3(s) + 2Fe(s)?

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Enthalpy

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Enthalpy

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AP Chemistry

Definition

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"Enthalpy" also found in:

Subjects (63)

Practice Questions (13)

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