The two air pollutants SO₃ and NO can react as follows: SO₃(g) + NO(g) → SO₂(g) + NO₂(g). 

(a) Predict the effect of the following changes to the amount of NO₂ when the reaction has come to equilibrium in a stainless steel bulb equipped with entrances for chemicals: (i) the amount of NO is increased; (ii) the SO₂ is removed by condensation; (iii) the pressure is tripled by pumping in helium. 

(b) Given that at a certain temperature K = 6.0 * 10³, calculate the amount (in moles) of NO that must be added to a 1.00-L vessel containing 0.245 mol SO₃(g) to form 0.240 mol SO₂(g) at equilibrium.