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Enthalpies of solution of BaCI(2)(s) and...

Enthalpies of solution of `BaCI_(2)(s)` and `BaCI_(2).2H_(2)O(s)` are `-20.0kJ mol^(-1)` and `8.0 kJ mol^(-1)`, respectively. Calculate `Delta_(hyd)H^(Theta)` of `BaCI_(2)` to `BaCI_(2).2H_(2)O`.

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The correct Answer is:
`-28kJ//"mole"`
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Ethalpies of solution of BaCI_(2)(s) and BaCI_(2).2H_(2)O(s) are -20.0kJ mol^(-1) and 8.0 kJ mol^(-1) , respectively. Calculate Delta_(hyd)H^(Theta) of BaCI_(2) to BaCI_(2).2H_(2)O .

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Concrete is produced form a mixture of cement, water and small stones. Small amount of gypsum, CaSO_(4).2H_(2)O is added in coment production to impove the subsequent hardening of concrete. The elevated temperature during the production of cement may lead to the formation of unwanted hemihydrate CaSO_(4)(1)/(2)H_(2)O according to reaction. CaSO_(4)2H_(2)O(s) rarr CaSO_(4)(1)/(2)H_(2)O(s)+(3)/(2)H_(2)O(g) The Delta_(f)H^(Theta) of CaSO_(2).2H_(2)O(s),CaSO_(4)(1)/(2)H_(2)O(s),H_(2)O(g) are -2021.0 kJ mol^(-1), -1575.0 kJ mol^(-1) and -241.8 kJ mol^(-1) , respectively. The respective values of their standard entropies are 194.0, 130.0 and 188.0 J K^(-1)mol^(-1) . The values of R = 8.314JK^(-1)mol^(-1) = 0.0831L bar mol^(-1)K^(-1) . Answer the following questions on the basis of above information. The formation of CaSO_(4)(1)/(2)H_(2)O at 298K is

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