Chapter 10, Problem 10.143QP

Interpretation Introduction

Interpretation: The mass percentage of Glucose sample has to be calculated.

Concept Introduction:

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,

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

Mass percentage: The ratio of calculated mass of compound to the total mass is called mass percentage. The mass percentage of a compound is ratio of calculated mass of compound to the total mass whole multiplied by 100. The mass percentage of compound can be given by the equation.

$\text{Mass}\text{percentage(\%)=}\frac{\text{Calculated}\text{mass(in}\text{g)}}{\text{Total}\text{mass(in}\text{g)}}\text{×100}$