Question

Which example has 1.2×1024 oxygen atoms?

Responses

2 moles of ammonia (NH3)
2 moles of ammonia left parenthesis uppercase N H subscript 3 end subscript right parenthesis

1 mole of water (H2O)
1 mole of water left parenthesis uppercase H subscript 2 end subscript uppercase O right parenthesis

1 mole of peroxide (H2O2)
1 mole of peroxide left parenthesis uppercase H subscript 2 end subscript uppercase O subscript 2 end subscript right parenthesis

2 moles of hydrogen gas (H2)
2 moles of hydrogen gas left parenthesis uppercase H subscript 2 end subscript right parenthesis

Answer 1

1 mole of peroxide (H2O2).

Reason: 1 mol = 6.022×10^23 molecules. Each H2O2 has 2 O atoms, so O atoms = 1 mol × 2 × 6.022×10^23 = 1.2044×10^24 ≈ 1.2×10^24.