Which of these items is least likely to cause an exhaust emissions test failure as a result of excessive nox emissions?
a. defective fuel injector
b. spark plug hot range
c. defective oxygen sensor
d. poor flow through the egr system

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :

its first and third is your answer i did the qustion the fourth isnt right