Chapter 10, Problem 10.2VC

Interpretation Introduction

Interpretation:

The result of calculated standard enthalpy of reaction has to be identified if the concentration of one of the reactant solution is twice as high as it was supposed to be.

Concept Introduction:

• Calorimetry can be defined as the measurement of changes in heat.
• Two types of Calorimetry are coffee cup calorimeter and bomb calorimeter.
• The change in heat of the system can be determined with the value of the heat capacity of the calorimeter.
• The heat capacity of the calorimeter can be given as,

${\text{C}}_{\text{cal}}\text{=}\frac{{\text{q}}_{\text{cal}}}{\text{ΔT}}$

Standard enthalpy of reaction:

The change in enthalpy that is associated with the formation of one mole of a substance from its related elements being in standard state is called standard enthalpy of formation (${\text{ΔH}}_{\text{f}}\text{°}$).  The standard enthalpy of formation is used to determine the standard enthalpies of compound and element.

The standard enthalpy of reaction is the enthalpy of reaction that takes place under standard conditions.

The equation for determining the standard enthalpies of compound and element can be given by,

${\text{ΔH°}}_{\text{reaction}}\text{=}{\displaystyle \sum {\text{nΔH°}}_{\text{f}}\text{(products)}}\text{-}{\displaystyle \sum {\text{mΔH°}}_{\text{f}}\text{(reactants)}}$