Define relative atomic mass and calculate the percentage yield of iron in the reaction between iron(III) oxide and aluminum.

Here are the solutions to the questions:

Part (a): Definition
The definition provided is for Relative Atomic Mass.
Relative Atomic Mass is the number of times the average mass of an atom of an element is heavier than $\frac{1}{12}$ the mass of a carbon-12 atom.

Part (b): Percentage Yield of Iron

Step 1: Write the balanced chemical equation.

$$\text{Fe}_2\text{O}_3(\text{s}) + 2\text{Al}(\text{s}) \rightarrow 2\text{Fe}(\text{s}) + \text{Al}_2\text{O}_3(\text{s})$$

Step