Question

If the total pressure for reaction is initially is 2 atm and the pressure is changed to 3 atm for the reaction to occur, then the value of (PA – PA0) for the reaction N2O → N2 + 0.5O2 is ____

(a) -2

(b) 2

(c) -1

(d) 1

The question was asked at a job interview.

Asked question is from Stoichiometry in chapter Rate Laws and Stoichiometry of Chemical Reaction Engineering

Answer 1

The correct answer is (a) -2

Best explanation: ∆n = 0.5

pA  = pA0 – \(\frac{a}{∆n}\) (P – P0)

(PA = PA0) = \(\frac{-1}{0.5}\)(3-2)

(PA = PA0) = -2.