Solid sulfur reacts with oxygen gas to form sulfur trioxide.

Writing The Unbalanced Chemical Equation for The Formation of Sulfur Trioxide

Writing the unbalanced chemical equation is accomplished by replacing the chemical names with the corresponding chemical formula in the word equation. This preveously determined word equation is "sulfur + oxygen ➝ sulfur trioxide”. The formula for the sulfur is S₈. Since sulfur was stated to be a solid, (s) is placed after the formula for sulfur: S(s). Oxygen was stated to be a gas: O₂(g). And sulfur trioxide gas is SO₃(g). The unbalanced equation is S(s) + O₂(g)  ➝ SO₃(g).

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