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There are 9 hydrogen atoms in 2-dimethylpropane, consisting of three different types: primary (6 hydrogens attached to the terminal carbon atoms), secondary (2 hydrogens attached to the middle carbon), and tertiary (1 hydrogen attached to the central carbon).
Decane has 10 carbon atoms and 22 hydrogen atoms in it.
In one molecule of C3H8 (propane), there are eight hydrogen atoms. This can be determined by looking at the subscript attached to the hydrogen (H) in the chemical formula C3H8. The subscript of 8 indicates that there are eight hydrogen atoms present in each molecule of propane.
In an alkane with 16 carbon atoms, every carbon atom will be bonded to four hydrogen atoms. Therefore, the total number of hydrogen atoms in an alkane with 16 carbon atoms would be 16 carbon atoms x 4 hydrogen atoms = 64 hydrogen atoms.
Cyclohexane has 12 hydrogen atoms. Each carbon atom in the cyclohexane ring is connected to two hydrogen atoms.