Consider first-order reaction 2 A ( g ) → 3 B ( s ) + C ( g ) . The reaction started with a 2M concentration of A at 27 °C. Here, A and B are optically active compounds having molar optical rotations

Question

Consider first-order reaction 2 A ( g ) → 3 B ( s ) + C ( g ) . The reaction started with a 2M concentration of A at 27 °C. Here, A and B are optically active compounds having molar optical rotations of 20° and 40°, respectively. The rate constant of the reaction is 1.386 × 1 0 − 2 se c − 1 . Find the total angle of rotation of the reaction mixture after 100 seconds. (Given: ln 2 = 0.693 )

TestHub · Accepted Answer

2 A ( g ) → 3 B ( g ) + C ( g ) At t = 0 , 2 M . At t = t , 2 − x 3 x /2 k A ​ = 2 K re l a t i o n ​ = 2.772 × 1 0 − 2 se c − 1 k A ​ = 2.772 × 1 0 − 2 × 100 = ln 2 − x 2 ​ ln 8 = ln 2 − x 2 ​ x = 1.75 r t o t a l ​ = 0.25 × ( − 20 ) + 2.625 × 40 = 10 0 ∘

Chemistry - Chemical Kinetics Question with Solution | TestHub

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