Chapter 10.6, Problem 10.5SC

Interpretation Introduction

Interpretation:

The amount of heat which is released when 1.00 g of $\text{Fe}\left(\text{s}\right)$ is reacted with excess ${\text{O}}_{\text{2}}\left(\text{g}\right)$ should be calculated.

Concept Introduction:

Number of moles is equal to the ratio of given mass to the molar mass.

The mathematical expression is given by:

Number of moles = $\frac{\text{given mass}}{\text{molar mass}}$

Now, according to the reaction, 1652 kJ heat is released when 4 moles of Fe reacts, thus by determining the number of moles of 1.00 g of iron and then multiply the number of moles of iron by heat released per four moles of iron. Hence, one can get the heat released when one mole of iron reacts.