How many molecules of ammonia can be produced from 15.0 moles of N2?

N2 + 3 H2 → 2 NH3

The answer to your question is 30 moles of Ammonia

Explanation:

Data

moles of N₂ = 15

Balanced chemical reaction

                 N₂  +  3 H₂  ⇒  2 NH₃

- Process

1.- Use proportions and cross multiplication to solve this problem

                1 mol of Nitrogen 2 moles of ammonia

                15 moles of Nitrogen x

                 x = (15 x 2) / 1

                 x = 30 / 1

                x = 30 moles of Ammonia

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.