Nitrogen dioxide, NO2, is a dark brown gas that is used to make nitric acid and to bleach flour. Nitrogen dioxide has a boiling point of 294 K at 101.3 kPa. In a rigid cylinder with a movable piston, nitrogen dioxide can be in equilibrium with colorless dinitrogen tetroxide, N2O4. This equilibrium is represented by the equation below.
2NO2(g) ó N2O4(g) + 58 kJ
73 State evidence from the equation that the forward reaction is exothermic. [1]
HIGHLIGHT TO SEE THE ANSWER
| heat term is on the right side of the equation |
74 Compare the rate of the forward reaction to the rate of the reverse reaction when the system has reached equilibrium. [1]
HIGHLIGHT TO SEE THE ANSWER
75 State one stress, other than adding or removing NO2(g) or N2O4(g), that would increase the amount of the dark brown gas. [1]
HIGHLIGHT TO SEE THE ANSWER
| Increase the temperature. Add heat. Decrease the pressure. Increase the volume. |
76 At standard pressure, compare the strength of intermolecular forces in NO2(g) to the strength of intermolecular forces in N2(g). [1]
HIGHLIGHT TO SEE THE ANSWER
| The attractions in N2(g) are weaker |
77 Determine the oxidation state of nitrogen in nitrogen dioxide. [1]
HIGHLIGHT TO SEE THE ANSWER