Final answer:
One mole of ammonia gas contains Avogadro's number of ammonia (NH₃) molecules, which is 6.022 x 10^23 molecules.
Step-by-step explanation:
One mole of ammonia gas contains Avogadro's number of ammonia molecules. Since ammonia's molecular formula is NH3, each molecule consists of one atom of nitrogen and three atoms of hydrogen. These atoms are linked with chemical bonds.
The mole ratio is an important concept that can be used to understand chemical reactions, such as the one where elemental nitrogen reacts with elemental hydrogen to produce ammonia. For example, in a reaction where 4.20 moles of hydrogen are reacted with an excess of nitrogen, a certain number of moles of ammonia are produced based on that ratio.
In summary, the number of ammonia molecules present in 1 mole is 6.022 x 1023 molecules, reflecting Avogadro's constant. The subscript below the H symbol in the chemical formula for ammonia indicates the presence of three hydrogen atoms within each molecule.