In the industrial production of sulphuric acid so3 is, Ask an Expert

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In the industrial production of sulphuric acid, SO₃ is carefully reacted with water:

SO₃ + H₂O → H₂SO₄

any excess SO₃ giving rise to what is called oleum, a solution of SO₃ in sulphuric acid. The relationship between the freezing point (f.p.) of sulphuric acid and the presence of small amounts of dissolved SO₃ is as below:

	Pure H₂SO₄	1 mol% SO₃	2 mol% SO₃	3 mol% SO₃
T_fp /°C	10.36	9.74	9.12	8.50

Assume that SO₃ in H₂SO₄ forms a solution without reaction. Graphically or otherwise, estimate the enthalpy of fusion of sulphuric acid (note that 1 mole % corresponds to a mole fraction of 0.01).

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Category:- Chemistry
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