Chemistry final help ya'll

the question is in the picture

-20kJ/mol minus 66kj/mo

Explanation:

2NO2 = N2O4

Delta H 2NO2 = +66 kj/mol

Delta H N2O4 = -20kJ/mol

Change in entropy = Change in heat of a system

Delta H = Hfinal minus Hinital

So in our case it would be

-20kJ/mol minus 66kj/mol

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds