Question

At 600°C oxides of nitrogen react with unburnt hydrocarbons in a catalytic converter in a car exhaust. The equation using methane as representative of a hydrocarbon molecule would be as follows.
4NO + CH4= 2N, + CO2 + 2H2O
Which statement is likely to be true about the energy change of this reaction?
A It is endothermic as heat energy is converted into chemical energy.
B It is exothermic as a high temperature is required. C it is exothermic as the triple bond NEO is broken. D It is exothermic as the products have large negative enthalpy changes of formation. ​

Answer 1

Answer:

Exothermic reaction

Explanation:Exothermic reactions examples

Examples are numerous: combustion, the thermite reaction, combining strong acids and bases, polymerizations. As an example in everyday life, hand warmers make use of the oxidation of iron to achieve an exothermic reaction: 4Fe + 3O2 → 2Fe2O3 ΔH⚬ = - 1648 kJ/mol.

Answer 2

Option (b) It is exothermic as a high temperature is required.

Catalytic converter is an apparatus used to reduce the emissions like carbon monoxide,  oxides and sulphur oxides.

Explanation:

• Given -At 600°C oxides of nitrogen reacts with unburnt hydrocarbons in a catalytic converter in car exhaust.
• The equation using methane as representative of a hydrocarbon molecule would be as follows.

$4NO + CH4= 2N+ CO2 + 2H2O$

• The reaction is an exothermic process where heat energy is liberated which is converted into chemical energy.
• These devices are used mainly in an internal combustion engine.
• They are used in the exhaust system.
• They can also be found in generators, buses and trucks. or heavy vehicles.

Option (b) It is exothermic as a high temperature is required.