The chemical formula for heptasulfur dioxide is ________. A) S2O7 B) S7O2 C) O2S D) SO2 E) S7O
The correct answer and explanation is:
The correct answer is B) S₇O₂.
Explanation:
Heptasulfur dioxide (S₇O₂) is a molecular compound consisting of seven sulfur (S) atoms and two oxygen (O) atoms. This specific combination of elements forms the chemical formula S₇O₂. Let’s break down the reasoning behind this:
1. Chemical Nomenclature:
- The prefix “hepta-“ indicates the presence of seven sulfur atoms.
- The compound name also includes “dioxide,” which specifies two oxygen atoms.
- Together, “heptasulfur dioxide” translates to S₇O₂, as it reflects the correct stoichiometric ratio.
2. Why Other Options Are Incorrect:
- A) S₂O₇: This would correspond to a compound with two sulfur atoms and seven oxygen atoms, which does not match the name “heptasulfur dioxide.”
- C) O₂S: This format suggests only one sulfur atom and two oxygen atoms, which corresponds to sulfur dioxide (SO₂), not heptasulfur dioxide.
- D) SO₂: This is the correct formula for sulfur dioxide, but it does not have seven sulfur atoms as required by the name “heptasulfur dioxide.”
- E) S₇O: This would indicate seven sulfur atoms and one oxygen atom, which is incorrect as “dioxide” implies two oxygen atoms.
3. Chemical Properties:
Heptasulfur dioxide is not a common compound and is typically studied in theoretical or specialized chemical contexts. It is one of the many possible combinations of sulfur and oxygen atoms, which form a diverse range of compounds due to sulfur’s variable oxidation states and its ability to catenate (bond with itself).
Understanding chemical formulas and nomenclature is essential in chemistry, as it helps scientists identify and communicate the structure and composition of compounds accurately.