Question

which of the following best explains why a structural formula of a chemical compound is more useful than a molecular formula?
both formulas identify the specific atoms in a particular compound. however, a structural formula also shows how the atoms in a compound are bonded together.
both formulas identify the types of atoms in a particular compound. however, a structural formula also shows how many atoms of each type are in a compound
both formulas show the location of each valence electron in a particular compound. however, a structural formula also shows the ratio of protons to neutrons within a compound
both formulas show the ratio of protons to neutrons within a particular compound. however, a structural formula also shows the location of each valence electron in a compound

Explanation:

• Analyze each option:
• Option 1: Molecular formula (e.g., \(C_2H_6O\)) identifies specific atoms (C, H, O) and their counts. Structural formula (e.g., for ethanol \(CH_3CH_2OH\)) shows bonding (C - C, C - H, C - O, O - H). This matches the role of structural vs molecular formulas.
• Option 2: Molecular formula already shows the number of each atom type (e.g., \(C_2H_6O\) has 2 C, 6 H, 1 O), so structural formula doesn't add this. Eliminate.
• Option 3: Neither molecular nor structural formulas show valence electron locations (Lewis structures or orbital diagrams do) or proton - neutron ratios (related to isotopes, not formulas). Eliminate.
• Option 4: Same as option 3, neither formula shows proton - neutron ratios or valence electron locations. Eliminate.

Answer:

A. Both formulas identify the specific atoms in a particular compound. However, a structural formula also shows how the atoms in a compound are bonded together.