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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
Tfp /°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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