According to the above equation, 3 moles of NO2 react with one moles form 2 moles of HNO3.
Therefore, number of moles of NO2 produced by 7.33 moles of HNO3, is given as :
3 moles of NO2 + 2 moles of HNO3,
x moles of NO2 + 7.33 moles of HNO3
By Cross multiplication, x = 7.33 × 3/2 = 10.99 moles.