8. Disequilibrium: The mixing ratio of NO in the atmosphere...

8. Disequilibrium: The mixing ratio of NO in the atmosphere is about 10 ppb for clean air, and about 200 ppb (0.2 ppm) for polluted air. Predict the amount of NO present in the atmosphere according to \"equilibrium\" chemistry. The relevant reaction is: $N_2 + O_2 \longrightarrow 2NO$ $K_p = (P_{NO})^2 / (P_{N_2} P_{O_2})$ Note: $\Delta G_f$ for NO is 86.7 kJ/mol (but the value for the reaction above is different by x2). Is the atmosphere at equilibrium? What might be maintaining this state of \"disequilbirum\"?

Transcript

00:02 Hi, part a is based on the lee chatlia principle.

00:05 According to this principle, if any change is made to an equilibrium, then the position of the equilibrium shifts in order to counteract the change so that the equilibrium can be re -established.

00:18 Suppose if more reactants are added to the equilibrium, then the equilibrium will shift in the forward direction to balance the change and if more of the products are added to the equilibrium, then the equilibrium will shift in the forward direction to balance the change.

00:30 Are added than the equilibrium shifts in the reverse direction.

00:34 Now in part 1, the concentration of no is increased.

00:39 That means more of reactant is added.

00:42 To contract this change, the equilibrium shifts in the forward direction.

00:47 In this way, the extra added nitrogen oxide is converted into the products and the equilibrium is re -established.

00:55 For the second part, some of the sulfur dioxide so2 is removed.

01:00 In this, we are removing the products so that to balance the equilibrium we want more products to be formed, therefore the equilibrium again shifts in the forward direction.

01:14 In third part, pressure is tripled by adding helium gas.

01:18 Whenever pressure is increased, the equilibrium shifts towards the side which has the fewer number of gases molecules so that the extra pressure is reduced.

01:29 But here, both the sides have the same.

01:31 Number of gaseous molecules, that means no change is observed...

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