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Commercial concentrated of NH₃(aq) is 28 percent ammonia by mass. Density of the solution =0.900 g/mL. Compute the a)molarity of the solution, b)molality of the solution, c) mole fraction of Ammonia.

Use thermodynamics to compute the enthalpy of given reaction as 2FeS₂(s) + (11/2) O₂(g) → Fe₂O₃(s) + 4SO₂(g)

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