Chapter 8, Problem 24QAP

Interpretation Introduction

(a)

Interpretation:

To determine the ?H when one mole of BaCl₂ precipitates out.

Concept introduction:

Enthalpy of reaction can be calculated as:

$\begin{array}{l}{\text{ΔH}}^{\text{o}}{}_{\text{rx}}\text{=}\sum _{}^{}\text{n}\left({\text{ΔH}}_{\text{f}}{}^{\text{o}}\text{(products)}\right)\text{-}\sum _{}^{}\text{n}\left({\text{ΔH}}_{\text{f}}{}^{\text{o}}\text{(reactants)}\right)\\ \text{where}\text{'}\text{n'}\text{represents}\text{number}\text{of}\text{moles}\text{in}\text{given}\text{reaction}\text{.}\end{array}$

Interpretation Introduction

(b)

Interpretation:

To determine the ?H when 15.00 g of BaCl₂ precipitates out.

Concept introduction:

Enthalpy of reaction can be calculated as:

$\begin{array}{l}{\text{ΔH}}^{\text{o}}{}_{\text{rx}}\text{=}\sum _{}^{}\text{n}\left({\text{ΔH}}_{\text{f}}{}^{\text{o}}\text{(products)}\right)\text{-}\sum _{}^{}\text{n}\left({\text{ΔH}}_{\text{f}}{}^{\text{o}}\text{(reactants)}\right)\\ \text{where}\text{'}\text{n'}\text{represents}\text{number}\text{of}\text{moles}\text{in}\text{given}\text{reaction}\text{.}\end{array}$

Enthalpy of reaction is directly proportional to amounts of reactants and products.