Final answer:
1 mole of NO2 contains approximately 6.022 x 10^23 molecules of NO2.
Step-by-step explanation:
The units of the mole are typically written as mol. The mole is a unit of measurement in chemistry that represents a certain amount of a substance. Specifically, 1 mole of any substance is equal to Avogadro's number (approximately 6.022 x 10^23) of particles, which could be atoms, molecules, ions, or other particles.
In the case of nitrogen dioxide (NO2), 1 mole of NO2 represents Avogadro's number of molecules of NO2. Since Avogadro's number is approximately 6.022 x 10^23, there would be approximately 6.022 x 10^23 molecules of NO2 in 1 mole of NO2.