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Molybdenum trioxide
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<p>Molybdenum trioxide describes a family of <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compounds</a> with the <a href="/facts/Chemical_formula/hghUtthl">formula</a> MoO3(H2O)n where n = 0, 1, 2. The anhydrous compound is produced on the largest scale of any <a href="/facts/Molybdenum/RX6vp2bF">molybdenum</a> compound since it is the main intermediate produced when molybdenum ores are purified. The anhydrous oxide is a precursor to molybdenum metal, an important alloying agent. It is also an important industrial <a href="/facts/Catalyst/LPBS7TQC">catalyst</a>. It is a yellow solid, although impure samples can appear blue or green. </p><p>Molybdenum trioxide occurs as the rare <a href="/facts/Mineral/LkUFbNmv">mineral</a> <a href="/facts/Molybdite/3Ne6vEjK">molybdite</a>. </p>