Hey someone please answer this...

31 mol N₂

General Formulas and Concepts:

Chemistry - Stoichiometry

Explanation:

Step 1: Define

25 mol HCl

Step 2: Identify Conversions

RxN:   4 mol HCl = 5 mol N₂

Step 3: Stoichiometry

= 31.25 mol N₂

Step 4: Check

We are given 2 sig figs. Follow sig fig rules and round.

31.25 mol N₂ ≈ 31 mol N₂

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.