Question

If 0.68 mol of no is reacted with 0.79 mol of o2 to produce no2 the limiting reactant is

Answer 1

 The limiting  reagent is   NO

    explanation 
writ e the balanced equation for reaction

2NO  + O2 →  2NO2

from the equation  above   2  moles of No reacted  with   1  mole  of  O2 to form 2  moles of NO2

the  mole ratio  between   No  to  NO2  is 1:1  therefore the moles of NO2   also  0.68 moles

the  mole ratio  between o2 to NO2  is  1:2 therefore the  moles  of NO2 = 1 x 0.79 = 1.58  moles, there  O2  is  in excess

this means  NO  is the limiting reagent