A scientist is preparing Aluminum Oxide (Al2O3) by reacting solid Aluminum and Oxygen gas together as shown by this chemical equation:4Al + 3O2 → 2Al2O3 The scientist measures the mass of Aluminum before the reaction and finds 107.92 grams. The scientist measures the mass of Aluminum Oxide after the reaction and finds 299.91 grams. The scientist concludes that 95.99 grams of Oxygen gas must have reacted with the Aluminum. Explain the law that the scientist used to predict the amount of Oxygen gas in the reaction and how that law was used to find the amount of Oxygen gas.