The equation 10HNO3 + 3S -> 3H2SO4 + 10NO

  1. The chemical equation above represents the reaction between nitric acid (HNO3) and sulfur (S) to form sulfuric acid (H2SO4) and nitrogen monoxide (NO). In the equation, the number of moles of each substance is represented before the formula, for example, 10 moles of HNO3 react with 3 moles of S to produce 3 moles of H2SO4 and 10 moles of NO.

  2. Reaction conditions: This reaction usually occurs at high temperatures.

  3. Reaction process: At high temperatures, nitric acid (HNO3), a strong oxidizing agent, will oxidize sulfur (S). Sulfur is oxidized from the oxidation state of 0 to +6, forming sulfuric acid (H2SO4). In this process, nitric acid is reduced from +5 to +2, forming nitrogen monoxide (NO).

  4. Occurring phenomena: During the reaction process, the release of nitrogen monoxide (NO) gas can be observed, which can be easily recognized by its pale green color.

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