ThermochemistryHard

Question

The enthalpies of formation of SO2(g), H2O(l), HCl(g) and H2SO4(l) are −70.97, −68.32, −22.1 and −188.84 (kcal mol−1). The enthalpies of solution of SO2, H2SO4 and HCl in dilute solution are −8.56, −22.05 and −17.63 (kcal mol–1), respectively. What is the enthalpy change for the reaction?

SO2(aq) + Cl2(g) + 2H2O(l) → H2SO4(aq) + 2HCl(aq)

Options

A.−74.18 kcal
B.−78.97 kcal
C.−43.71 kcal
D.−87.14 kcal

Solution

$\Delta H = \left\lbrack ( - 188.84) + ( - 22.05) + 2( - 22.1) + 2( - 17.63) \right\rbrack - \left\lbrack ( - 70.97) + ( - 8.56) + 0 + 2( - 68.32) \right\rbrack $$$= - 74.18\text{ kcal}$$

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