For the reaction, X (s) Y (s)+ Z (g), the plot of p_ Z p^ versus 10^ 4 T is given below (in solid line), where p_ Z is the pressure (in bar) of the gas Z at temperature T and p^ =1 bar. (Given, d ( K) d ( 1 T ) =- H^ R , where the equilibrium constant, K= p_ z p^ and the gas constant, R =8.314 ~J ~K

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For the reaction, X (s) Y (s)+ Z (g), the plot of p_ Z p^ versus 10^ 4 T is given below (in solid line), where p_ Z is the pressure (in bar) of the gas Z at temperature T and p^ =1 bar. (Given, d ( K) d ( 1 T ) =- H^ R , where the equilibrium constant, K= p_ z p^ and the gas constant, R =8.314 ~J ~K ^ -1 ~mol ^ -1 ) The value of standard enthalpy,  &#8710; H o  (in  kJ &#160; mol - 1 ) for the given reaction is ___.

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Correct answer: A. A

Slop  g  the Given graph d &#160; ln p z p &#981; d &#160; 10 4 T = &#8722; 7 + 3 12 &#8722; 10 = &#8722; 2 d &#160; ln p z p &#981; d 1 T &#8722; 2 &#215; 10 4 = &#8722; &#916;H o R &#916;H o = 2 &#215; 10 4 &#215; R = 2 &#215; 8 .314 &#215; 10 &#160; kJ / mol = 166 . 28

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