Chemical Kinetics and Nuclear ChemistryHard

Question

At 370 K a gaseous reaction X → 2Y + Z is found to be first order. Starting the reaction from pure X the total pressure is observed 156 mm Hg after 15 minutes. After long time pressure is observed 240 mm Hg when X is completely dissociated. What will be the pressure of X after 15 minutes ?

Options

A.42 mm Hg
B.54 mm Hg
C.36 mm Hg
D.80 mm Hg

Solution


= 0
∵ 2P0 + P0 = 240 mm Hg
∴ P0 = 80 mm Hg
After 15 min     P0 + 2P = 156 Hg
      P = 38 mm Hg
Pressure of X after 15 min = P0 - P
      = 42 mm Hg

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