Final answer:
A hydrocarbon chain with five carbon atoms and one double bond, an alkene, follows the formula CnH2n for hydrogen atom calculation. In this case, n=5, meaning there are 10 hydrogen atoms in the molecule.
Step-by-step explanation:
The student is asking about the number of hydrogen atoms in hydrocarbons, specifically in a chain of five carbon atoms with one double bond and the remaining bonds being single. Generally, in a saturated hydrocarbon (alkane), each carbon atom is bonded to four other atoms (hydrogen or other carbons), resulting in no double or triple bonds. However, the presence of a double bond indicates that this molecule is an alkene, which means it is not fully saturated with hydrogen atoms due to the presence of the double bond.
The general formula for calculating the number of hydrogen atoms in an alkene is CnH2n, where n is the number of carbon atoms. Given that the molecule has five carbon atoms (n=5), we substitute into the formula to find the number of hydrogen atoms, which is 2(5) = 10. Therefore, a hydrocarbon chain with five carbon atoms and one double bond has 10 hydrogen atoms.