Which of the following is the best example of an open system? (2 points)
question 1 options:

1) a car engine

2) our universe

3) a greenhouse

4) an insulated gas cylinder

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?

The molecular weight of carbon dioxide, co2, is 44.00 amu, and the molecular weight of nitrous dioxide, no2, is 46.01 amu, so no2 diffuses co2

Which of the four hypothetical substances you investigated would be most harmful to living organisms? 50 points!