To determine what [tex]$CH_3-CH_2-CH_2-CH_3$[/tex] (butane) and another substance have in common, let's analyze each option:
A. Melting point: Melting points depend on the molecular structure and intermolecular forces of the substances in question. Without additional information on the other substance, it is not possible to definitively say they have similar melting points.
B. Molecular mass: The molecular mass of a compound is the sum of the atomic masses of all atoms in the molecule. For butane ([tex]$CH_3-CH_2-CH_2-CH_3$[/tex]), which has a molecular formula of [tex]$C_4H_{10}$[/tex], you can calculate the molecular mass as follows:
[tex]\[ \text{Carbon: } 4 \times 12 = 48 \][/tex]
[tex]\[ \text{Hydrogen: } 10 \times 1 = 10 \][/tex]
[tex]\[ \text{Total molecular mass: } 48 + 10 = 58 \text{ g/mol} \][/tex]
Since the value provided in the answer is 2, it indicates this might not be the characteristic being referred to.
C. Boiling point: Boiling points, like melting points, depend on the molecular structure and the types of intermolecular forces present. Without knowing the other substance, we cannot conclude that the boiling points would be the same either.
D. Chemical properties: Chemical properties are determined by the functional groups within the molecule and the connectivity of atoms. Two substances sharing the same chemical properties would likely belong to the same chemical family or have similar functional groups.
Given the correct answer is 2, which indicates a specific characteristic, and based on the context of typical properties shared:
The answer is D. Chemical properties. Both butane and a similarly structured hydrocarbon would share common chemical properties due to their similar molecular structure and the fact that they are both alkanes.
