What are the sources of PAN And VOCs

Explanation:

Nitrogen dioxide comes from the engines of cars and trucks and from factories and power plants that burn coal. Other chemicals that help make PAN are called Volatile Organic Compounds (VOCs). VOCs get into the air from paint, gasoline, and other chemicals. Sunlight changes the VOCs into other chemicals.

n+h→nh3

we must remember that nitrogen and hydrogen are both diatomic molecules in their standard gas form. this adjusts the equation to

n2+h2→nh3

now we need to adjust coefficients in order to balance the atoms on each side of the equation. currently we have 2 atoms of nitrogen and 2 atoms of hydrogen on the reactant side and 1 atom of nitrogen and 3 atoms of hydrogen on the product side.

we can balance the hydrogens by placing a coefficient of 2 in front of ammonia and a coefficient of 3 in front of the hydrogen.

n2+3h2→2nh3

this gives us 6 hydrogen on each side and coincidentally the nitrogens now equal 2 on each side.

you need to have a picture of the atom that way we can answer it