Final answer:
Ethanol: Each labeled carbon is bonded to 3 hydrogens. Propane: Each labeled carbon is bonded to 2 hydrogens. Butane: Each labeled carbon is bonded to 3 hydrogens. Methane: The labeled carbon is bonded to 4 hydrogens.
Step-by-step explanation:
Ethanol (C2H6O): There are two labeled carbons in ethanol, and each carbon is bonded to three hydrogen atoms. So, each labeled carbon in ethanol is bonded to 3 hydrogens.
Propane (C3H8): Propane has three labeled carbons. Each carbon in propane is bonded to two hydrogen atoms. So, each labeled carbon in propane is bonded to 2 hydrogens.
Butane (C4H10): Butane has four labeled carbons. Each carbon in butane is bonded to three hydrogen atoms. So, each labeled carbon in butane is bonded to 3 hydrogens.
Methane (CH4): Methane has one labeled carbon. This carbon is bonded to four hydrogen atoms. So, the labeled carbon in methane is bonded to 4 hydrogens.