To determine which formula equation represents the burning of sulfur to produce sulfur dioxide, let's analyze each of the provided chemical reactions:
1. Equation 1: [tex]\( S(s) + O_2(g) \xrightarrow{\triangle} SO_2(g) \)[/tex]
- This equation represents sulfur (S) in its solid form reacting with oxygen gas (O₂) to form sulfur dioxide (SO₂) gas. This is a direct reaction involving the burning of sulfur in the presence of oxygen.
2. Equation 2: [tex]\( 2 H_2S(s) + 3 O_2(g) \longrightarrow 2 H_2O(l) + 2 SO_2(g) \)[/tex]
- This equation describes hydrogen sulfide (H₂S) reacting with oxygen to produce water (H₂O) and sulfur dioxide (SO₂). Although sulfur dioxide is one of the products, the reactant here is hydrogen sulfide, not elemental sulfur.
3. Equation 3: [tex]\( 4 FeS_2 + 11 O_2 \longrightarrow 2 Fe_2O_3 + 8 SO_2 \)[/tex]
- This equation involves iron disulfide (FeS₂) reacting with oxygen to form ferric oxide (Fe₂O₃) and sulfur dioxide (SO₂). Again, even though sulfur dioxide is produced, the reactant is iron disulfide, not elemental sulfur.
4. Equation 4: [tex]\( 2 SO_2(g) + O_2(g) \xrightarrow{V_2O_5} 2 SO_3(g) \)[/tex]
- This equation represents sulfur dioxide (SO₂) reacting with oxygen (O₂) in the presence of a vanadium(V) oxide catalyst to produce sulfur trioxide (SO₃). There's no elemental sulfur involved in this reaction.
From the above analysis, Equation 1 [tex]\( S(s) + O_2(g) \xrightarrow{\triangle} SO_2(g) \)[/tex] correctly represents the burning of sulfur to produce sulfur dioxide. This reaction specifically shows elemental sulfur reacting directly with oxygen to form sulfur dioxide, matching the conditions required.
Therefore, the correct formula equation is:
[tex]\[ S(s) + O_2(g) \xrightarrow{\triangle} SO_2(g) \][/tex]
