Final answer:
The change in pressure of NO₂ when it decreases from 0.90 atm to 0.30 atm is -0.60 atm.
Step-by-step explanation:
To find the change in pressure when the pressure of NO₂ decreases from 0.90 atm to 0.30 atm, we can simply subtract the final pressure from the initial pressure.
Change in Pressure = Final Pressure - Initial Pressure
Change in Pressure = 0.30 atm - 0.90 atm = -0.60 atm
Therefore, the change in pressure when the pressure of NO₂ decreases from 0.90 atm to 0.30 atm is -0.60 atm. This change elucidates a notable -0.60 atm shift, delineating the extent of pressure reduction undergone by the NO₂, crucial in comprehending alterations in gaseous states and their impacts within various chemical and environmental contexts.