Please explain how to get this answer step by step

The answer to your question is 4.72 x 10²⁵ molecules or 472.87 x 10²³ molecules

Explanation:

Data

number of molecules = ?

number of moles = 78.51 moles of N₂O₅

Process

To solve this problem remember the one mol of any substance equals the Avogadro's number (6.023 x 10²³).

1.- Use proportions and cross multiplication to find the answer.

                        1 mol of N₂O₅ 6.023 x 10²³ molecules

               78.51 moles of N₂O₅   x

                        x = (78.51 x 6.023 x 10 ²³) / 1

                        x = 4.72 x 10²⁵ molecules or 472.87 x 10²³ molecules

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.