Air contain 99% and gases. Then why don't they combine to form NO under the standard conditions? Given that the standard free energy of formation of NO(g) is 86.7 kJ .

Air contain 99% and gases. Then why don't they combine to form NO un

1.	Air contain 99% and gases. Then why don't they combine to form NO under the standard conditions? Given that the standard free energy of formation of NO(g) is 86.7 kJ .
Answer» tains 99% of Nitrogen and Oxygen. Given, the STANDARD FREE energy of formation of NO is 86.7 . These gases at sea level "do not react" with each other and form Nitric acid. But they "combine" to form the nitric oxide (NO) at temperature above . It is then OXIDIZED by the ozone to Nitrogen dioxide. Nitrogen dioxide is toxic to LIVING tissues, and produce acid rain and photochemical smog.