I think it was sue to she has all the details to seem like it was her
Reacting to produce hydrogen gas is a chemical property
Valence electrons determine its valency ? (The group, as in its oxidation state and stability)
Answer:

Explanation:
They gave us the masses of two reactants and asked us to determine the mass of the product.
This looks like a limiting reactant problem.
1. Assemble the information
We will need a chemical equation with masses and molar masses, so, let's gather all the information in one place.
Mᵣ: 239.27 32.00 207.2
2PbS + 3O₂ ⟶ 2Pb + 2SO₃
m/g: 2.54 1.88
2. Calculate the moles of each reactant

3. Calculate the moles of Pb from each reactant

4. Calculate the mass of Pb

Answer:
The pressure will increase due ot expnasion of gasses in a closed sealed tube tube .
Explanation: