Question

1. what is the percentage of the element aluminum in the compound aluminum oxide (al₂o₃)? enter the correct whole numerical number in the box. %

Explanation:

Step1: Calculate molar mass of \(Al_2O_3\)

Molar mass of \(Al = 27\) g/mol, molar mass of \(O = 16\) g/mol.
For \(Al_2O_3\), molar mass \(= 2\times27 + 3\times16 = 54 + 48 = 102\) g/mol.

Step2: Calculate mass of Al in \(Al_2O_3\)

Mass of Al \(= 2\times27 = 54\) g/mol.

Step3: Calculate percentage of Al

Percentage \(= \frac{\text{Mass of Al}}{\text{Molar mass of }Al_2O_3} \times 100 = \frac{54}{102} \times 100 \approx 52.94\%\), rounded to whole number is 53.

Answer:

53