(Originais Teachy 2023) - Question Medium of Sciences

During a chemistry class, the teacher mixed 2 grams of hydrogen (H2) with 16 grams of oxygen (O2) in a closed container. After the reaction, it was observed that all the reactants had completely reacted. The students are required to apply Lavoisier's and Proust's laws of ponderal to understand the conservation of mass and the constancy of the mass proportions of the substances reacting with each other. Considering that the reaction produced water (H2O), which is a substance composed of 2 parts of hydrogen to 16 parts of oxygen, the following is requested: 1. Identify and explain which ponderal law is applied to justify that the total mass of the products formed is equal to the total mass of the reactants. 2. Calculate the mass of water formed in the reaction and verify if the mass ratio between hydrogen and oxygen in water is in accordance with Proust's Law. Consider the atomic masses: H = 1 u and O = 16 u.