Answer:
mole ratio of Al to O₂ is 4 to 3.
Explanation:
Balance the equation => 2Al₂O₃ => 4Al + 3O₂ => mole ratio of Al to O₂ is 4 to 3.
Note: The coefficients in the form smallest whole number ratios for an equation is known as 'The Standard Equation'. The values represent moles and the fixed reaction ratios of the substances in the process.
Example 3H₂ + N₂ => 2NH₃ says if 3 moles H₂ react with 1 mole N₂ the process will always give 2 moles NH₃. Same in your post... If 2 moles Al₂O₃ decompose the process will always give 4 moles aluminum and 3 moles molecular oxygen. Such is true for all balanced molecular equations. :-)
