Chapter 5, Problem 84AP

Interpretation Introduction

Interpretation:

The number of moles for ethane combustion required to heat $371\text{ g}$ of water is to be calculated.

Concept introduction:

The specific heat of a material can be referred to as the amount of heat used to raise the temperature of $1°\text{C}$ for $1\text{ g}$ material.

The heat related with the change in temperature of a material can be determined as

$q=sm\Delta T$

Here, q is the heat, s is the specific heat, m is mass, and $\Delta T$ is the change in temperature of the material.

The change in temperature of the material can be determined as

$\Delta T=T_{\text{final}}-T_{\text{initial}}$

Here, $\Delta T$ is the change in temperature, $T_{\text{final}}$ is the final temperature, and $T_{\text{initial}}$ is the initial temperature.

The standard enthalpy for a reaction is the amount of enthalpy that occurs at standard conditions.

The standard enthalpy of reaction is to be determined using the equation given below:

$\Delta H{°}_{\text{rxn}}={\displaystyle \sum n}\Delta H_{\text{f}}^{\text{°}}\left(\text{products}\right)-{\displaystyle \sum m}\Delta H_{\text{f}}^{°}\left(\text{reactants}\right)$

Here, the stoichiometric coefficients are represented by m for reactants and n for products, enthalpy of formation at standard conditions are represented by $\Delta H_{\text{f}}^{°}$.

The value of enthalpy of formation of an element is zero at its most stable state.