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Kp or Kc from initial amounts and one measured equilibrium amount

This type of question, asked 4 times: 27 Jun 2022, 28 Jul 2022, 11 Apr 2023, 2 Apr 2025. All 5 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    27 Jun 2022

    54
     2NOCl(g)⇌2NO(g)+Cl2( g)\ 2NOCl(g) \rightleftharpoons 2NO(g) +Cl_{2}(\text{ }g) In an experiment, 2.0 moles of NOClNOCl was placed in a one-litre flask and the concentration of NONO after equilibrium established, was found to be 0.4 mol/Lmol/L. The equilibrium constant at 30∘C30^{\circ}C is ____\_\_\_\_ ×10−4\times10^{- 4}.

  2. Question 2

    28 Jul 2022

    145
    At 600 K,2 mol600\text{ }K,2\text{ }mol of NONO are mixed with 1 mol1\text{ }mol of O2O_{2}.
    2NO(g)+O2( g)⇄2NO2( g)2NO_{(g)}+O_{2}(\text{ }g) \rightleftarrows 2NO_{2}(\text{ }g)
    The reaction occurring as above comes to equilibrium under a total pressure of 1 atm. Analysis of the system shows that 0.6 mol0.6\text{ }mol of oxygen are present at equilibrium. The equilibrium constant for the reaction is____ (Nearest integer).

  3. Question 3

    11 Apr 2023

    142
    4.5 moles each of hydrogen and iodine is heated in a sealed ten litre vessel. At equilibrium, 3 moles of HI were found. The equilibrium constant for H2( g)+I2( g)⇌2HI(g)H_{2}(\text{ }g) +I_{2}(\text{ }g) \rightleftharpoons 2HI(g) is .....

  4. Question 4

    11 Apr 2023

    51
    A mixture of 1 mole of H2OH_{2}O and 1 mole of COCO is taken in a 10 litre container and heated to 25 K25\text{ }K. At equilibrium 40%40\% of water by mass reacts with carbon monoxide according to the equation: CO(g)+H2O(g)⇌CO2( g)+H2( g)CO(g) +H_{2}O(g) \rightleftharpoons CO_{2}(\text{ }g) +H_{2}(\text{ }g). The equilibrium constant KC×102K_{C}\times10^{2} for the reaction is___ (Nearest integer)

  5. Question 5

    2 Apr 2025

    49
    Consider the following equilibrium,
    CO(g)+2H2( g)⇌CH3OH(g)CO(g) + 2H_{2}(\text{ }g) \rightleftharpoons {CH}_{3}OH(g)
    0.1 mol of CO along with a catalyst is present in a 2dm32{dm}^{3} flask maintained at 500 K . Hydrogen is introduced into the flask until the pressure is 5 bar and 0.04 mol of CH3OH{CH}_{3}OH is formed. The Kp∘K_{p}^{\circ} is ____\_\_\_\_ ×10−3\times 10^{- 3} (nearest integer). Given : R=0.08dm3R = 0.08{dm}^{3} bar K−1 mol−1K^{- 1}{\text{ }mol}^{- 1} Assume only methanol is formed as the product and the system follows ideal gas behaviour.