A metal M of mass 0.600 g dissolves in dilute acid and gives 0.560 L of hydrogen at STP, where 11.2 L of hydrogen is one equivalent. The vapour density of the metal chloride, relative to hydrogen, is 47.5. What is the atomic mass of M? Atomic masses in g mol⁻¹: Cl 35.5.

ChemistryAdvancedHigh School (11–12)Atoms and Molecules › The Mole Concept Olympiad

A metal $\text{M}$ of mass $0.600\ \text{g}$ dissolves in dilute acid and gives $0.560\ \text{L}$ of hydrogen at STP, where $11.2\ \text{L}$ of hydrogen is one equivalent. The vapour density of the metal chloride, relative to hydrogen, is $47.5$ . What is the atomic mass of $\text{M}$ ? Atomic masses in $\text{g mol}^{-1}$ : Cl 35.5.

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← Nitric acid is made from ammonia in three steps. First, 4 NH₃ + 5 O₂ → 4 NO + 6 H₂O, which converts 90% of the ammonia. Second, 2 NO + O₂ → 2 NO₂, which is complete. Third, 3 NO₂ + H₂O → 2 HNO₃ + NO, which is complete, and the NO it releases is not collected. Starting from 34.0 g of NH₃, what mass of HNO₃ is made? Atomic masses in g mol⁻¹: H 1.0, N 14.0, O 16.0.A rigid vessel holds 1.00 mol of N₂ and 2.00 mol of H₂. The reaction N₂ + 3 H₂ → 2 NH₃ proceeds until 30% of the nitrogen has been used. What is the average molar mass of the gas mixture then? Atomic masses in g mol⁻¹: H 1.0, N 14.0. →

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