How many moles are there in 3.9 grams of potassium

Answer:
0.0997 mol K
Explanation:
First of all, the picture and your question do NOT match so I will solve for what you are asking for.
3.9g x 1 mol/39.10 g = 0.0997 mol K
The 39.10 grams is the atomic mass of potassium