How many moles of Na are in 42g of Na?

n=m/M, so

Explanation:

Molar mass of Na is 22,9... so rounded to 23

n=42g/23g/mol

=1,826mol

the link still does not work even when adding it to the url bar

explanation:

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.