Answer to Question #348502 in General Chemistry for Grace

Question

One mole nitrogen oxide, NO, reacts with oxygen gas to produce a brown gas. How many moles NO must react with excess oxygen to release 120kJ of

heat?

Answer 1

2NO + O₂ = 2NO₂ ∆H= -114 kJ

2NO + O₂ + 114 kJ = 2NO₂

2mol NO — 114 kJ

X — 120 kJ

X= 2 * 120 / 114 = 2,1 mol NO

Answer: 2,1 mol NO