ThermochemistryHard

Question

The enthalpy change for the reaction, NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l) is −57 kJ.

Predict the value of the enthalpy change in the following reaction.

Ba(OH)2(aq) + H2SO4(aq) → BaSO4(s) + 2H2O(l)

Options

A.−57 kJ
B.−76 kJ
C.−114 kJ
D.−200 kJ

Solution

If BaSO4 were water soluble, then

$\Delta H_{\text{expected}} = 2 \times ( - 57) = - 114\text{ kJ}$

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