9 g H₂O = 0.5 mole. Each molecule contains 10 protons. Total protons = 0.5 × 10 × Nₐ = 3.011 × 10²⁴.
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In the reaction 2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O, the mass of sodium hydroxide required to neutralize 49 g of sulphuric acid is
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In the reaction N₂ + 3H₂ → 2NH₃, a mixture of 2 moles of N₂ and 3 moles of H₂ is allowed to react. The limiting reactant in this mixture is
