A vat containing 5 kg of acetic acid was accidentally spilled over a number of marble blocks. Acetic acid reacts with the calcite (CaCO₃) in marble: CaCO₃(s) + CH₃CO₂H(aq) → (CH₃CO₂)₂Ca(aq) + CO₂(g) + H₂O(l). If the marble blocks have a mass of 100 g, determine the number of blocks that was damaged. Assume the blocks are made of pure calcite and it is considered damaged if 5.0% of its mass reacted.

Lauryl sulfate is an anion found in cleaners and detergents. Its structure is shown below:

Assuming lauryl sulfate decomposes according to the following reaction:

C₁₂H₂₅SO₄^–(aq) + 18 O₂(aq) → 12 CO₂(aq) + 12 H₂O(l) + H⁺(aq) + SO₄^2–(aq)

Calculate the mass of O₂ required to decompose 15.0 g of lauryl sulfate.

If 5.7 moles of N₂O₅ react, how many moles of NO₂ form?

N₂O₅( g) → NO₂( g) + O₂(g)

According to the following chemical equation, how many grams of HBr are needed to completely dissolve 1.3 kg pure iron?

Fe(s) + HBr(aq) → FeBr₂(aq) + H₂(g).

Potassium superoxide, KO₂, is used to convert carbon dioxide and water into oxygen

4 KO₂ (s) + 4 CO₂ (g) + 2 H₂O (g) → 4 KHCO₃ (s) + 3 O₂ (g)

Calculate the number of molecules of O₂ (g) produced from the 0.0692 g CO₂ (g)