⚗️ Standard Enthalpies of Formation

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Q1. Write equations for the formation of (a) MgCO_(3 (s)) and (b) C_6 H_12 O_(6 (s)) from their respective elements in their standard states. Include the value of ΔH°_f for each equation.

Standard enthalpy of formation for magnesium carbonate: (ΔH°_f=−1095.7 KJ/mol)

Standard enthalpy of formation for glucose: ▭(ΔH°_f=−1273.3 KJ/mol)

Q2. Write equations for the formation of (a) NaCl_( (s)) and (b) Pb(NO_3 )_(2 (s)) from their respective elements in their standard states. Include the value of ΔH°_f for each equation.

The standard enthalpy of formation, or standard heat of formation, of a compound is the change in enthalpy that accompanies the formation of one mole of the compound from its elements in their standard states.

Note that standard enthalpies of formation are always given in units of kJ/mol of the compound formed.

Standard Enthalpy of Reaction

The standard enthalpy of reaction is the enthalpy change that occurs in a system when a chemical reaction transforms one mole of matter under standard conditions.