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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 equilibrium pressure of water vapour in closed vessel containing CaSO_(4)2H_(2)O(s),CaSO_(4)(1)/(2)H_(2)O(s) and H_(2)O(g) at 298K (Antilog -3.14 = 7.24 xx 10^(-4)) is