Asked by Grace
Hydrogen peroxide has the molecular formula H2O2. What does this statement mean?
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Saying hydrogen peroxide has the molecular formula H2O2 means a single molecule contains two hydrogen atoms and two oxygen atoms.
What that statement tells you
- the types of atoms present: hydrogen and oxygen
- the number of each in one molecule: 2 H, 2 O
- the molecular (molar) mass: about 34.02 g·mol⁻¹ (2×1.008 + 2×16.00)
What it does not tell you
- the arrangement or bonding of the atoms (connectivity or 3D shape). The structural formula is H–O–O–H (it contains an O–O single bond, the peroxide linkage).
- properties such as polarity, reactivity or phase.
Note: the empirical (simplest whole-number) formula for H2O2 is HO (ratio 1:1), but that loses the actual count per molecule.
What that statement tells you
- the types of atoms present: hydrogen and oxygen
- the number of each in one molecule: 2 H, 2 O
- the molecular (molar) mass: about 34.02 g·mol⁻¹ (2×1.008 + 2×16.00)
What it does not tell you
- the arrangement or bonding of the atoms (connectivity or 3D shape). The structural formula is H–O–O–H (it contains an O–O single bond, the peroxide linkage).
- properties such as polarity, reactivity or phase.
Note: the empirical (simplest whole-number) formula for H2O2 is HO (ratio 1:1), but that loses the actual count per molecule.
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