ap chemisrty

posted by .

Kp for the following reaction is 0.16 at 25°C.
2 NOBr(g) 2 NO(g) + Br2(g)
The enthalpy change for the reaction at standard conditions is +16.3 kJ. Predict the effect of the following changes on the position of the equilibrium; that is, state which way the equilibrium will shift (left, right, or no change) when each of the following changes is made.
(a) removing some NOBr(g)
(b) adding more NOBr(g)
(c) decreasing the container volume
(d) decreasing the temperature

  • ap chemisrty -

    Here is what you need to know.
    This is a Le Chatelier's Principle problem. Le Chatelier's principle is an elegant one with many elegant words to describe. Students sometimes get lost in the elegant words. Here it is in simple words. Whatever we do to a system in equilibrium, the reaction will shift to UNDO what we did. Simple!.
    A. removing NOBr means the reaction will shift to add more NOBr. [Remember: there are only three things to consider. a. the reaction shifts to the right, b. the reaction shifts to the left, c. there is no change.
    So let's look at removing NOBr. If it goes to the right, we use up NOBr which makes it smaller. Wrong answer. The reaction shifts to the left. That forms NOBr making it greater. Does that undo what we did. Yes. So that must be the answer.
    b. Adding more NOBr. The reaction will shift so as to UNDO what we did meaning it will shift to make NOBr smaller. Which way uses NOBr. That is the shift to the right (see reasoning form part a).
    Now you're on your own for c and d but here are some hints.
    c. Decreasing volume means increasing pressure. Shift is to side with smaller number of moles.
    d. When T is involved, rewrite the equation this way using the information in the problem.
    2NO2 + heat ==> 2NO + Br2

  • ap chemisrty -

    drg

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    . For the gas reaction at low pressure 2NOBr ↔ 2NO + Br2 ΔH = +61.1 kJ which of the following statements are true?
  2. Chemistry

    . For the gas reaction at low pressure 2NOBr ¡ê 2NO + Br2 ¥ÄH = +61.1 kJ which of the following statements are true?
  3. Chemistry

    Given the elementary reaction: 2 NOBr==>2 NO + Br2 k = 0.80 Which variables obtained for this reaction will produce a straight line?
  4. chemistry

    A possible mechanism for the overall reaction Br2 (g) + 2NO (g) -> 2NOBr (g) is NO (g) +Br2 (g) (equilibrium arrows: on top it says k1 and on bottom k-1) NOBr2 (g) (fast) step 1 NOBr2 (g) + NO (g) ->(on top of arrow k2) 2NOBr …
  5. chemistry

    In a reaction involving the bromination of acetone, the following initial concentraions were present in the reaction mixture. acetone (0.8mol/L), H+ (0.2 mol/L), Br2 (0.004 mol/L) At 25 degrees C, it took 240s before the colour of …
  6. Check my answers? (Chemistry)

    I only get one chance for each of these questions so I was wondering if someone could check my answers, thanks! 1. Consider the following reaction at equilibrium. 2 BrNO(g) ---> 2 NO(g) + Br2(g) Predict the effect of the following …
  7. Chemistry

    Kp for the following reaction is 0.16 at 25°C. 2 NOBr(g) (reverse reaction arrow-> <-) 2 NO(g) + Br2(g) What happens when you decrease and increase volume?
  8. Science help

    Will someone please check my work for me?
  9. Chemistry

    Nitrosyl bromide, NOBr, readily dissociated according to the following equilibrium equation: 2 NOBr (g) ----> 2 NO(g) + Br2 (g) NOBr was placed in a 1.00 L flask at 25.0oC and allowed to dissociated. At equilibrium, 0.17 moles of …
  10. chemistry

    For the following reaction at equilibrium, which change would shift the position of equilibrium toward forming more products?

More Similar Questions