Chemistry · Grades 9–12
Organic chemistry · Formula reference 1
Formula reference
Rule and assumptions
Acyclic alkane hydrogen count
This rule requires an acyclic saturated hydrocarbon.
CₙH₂ₙ₊₂
One-double-bond hydrocarbon
CnH2n applies here to an acyclic hydrocarbon with one double bond. A formula alone does not distinguish an alkene from a cycloalkane.
CₙH₂ₙ
Carbon balance on combustion
In complete hydrocarbon combustion, each carbon atom contributes one CO₂ molecule. This is a paper stoichiometry model.
n(CO₂) = carbon count × n(hydrocarbon)
Alcohol-family molar mass
For a saturated acyclic monohydric alcohol, CnH2n+2O, sum all atom masses. The formula is also compatible with ether isomers.
CₙH₂ₙ₊₂O; M = 12n + (2n + 2) + 16
Hydrocarbon unsaturation index
For a neutral closed-shell hydrocarbon, each ring or double bond adds one DBE; a triple bond adds two.
DBE = (2C + 2 − H)/2 for a hydrocarbon
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
Learning preview · independent educational and translation review required. Suggested grades are not official curriculum alignment.