Answer: 8 mol.
- A 2 mol
- B 4 mol
- C 6 mol
- D 8 mol
Correct answer: D. 8 mol
Explanation: Each H2SO4 molecule has 4 oxygen atoms, so 2 moles H2SO4 contain 8 moles of oxygen atoms.
Mass connects to moles via molar mass, and moles connect to particle count via Avogadro's number or to gas volume via the 22.4 L/mol rule at STP.
Concept context
The mole is chemistry's counting unit. Learn to relate mass, volume, and number of particles using Avogadro's number and molar mass, the foundation of all stoichiometry and reaction calculations.