how many potassium atoms are in 89.3 grams of potassium carbonate

Question

how many potassium atoms are in 89.3 grams of potassium carbonate

Answer 1

I will explain how to solve this, and you can fill in the math.

 

(1) Find the molecular weight of K₂CO₃ in grams.  Either look it up or add the atomic weights: 2K + C + 3O.

 

(2) Divide the given mass of 89.3 grams by the molecular weight of K₂CO₃.  That gives the number of moles of K₂CO₃.

 

(3) Multiply the number of moles of K₂CO₃ by Avogadro's number, which is 6.02 x 10²³.  That gives the number of molecules of K₂CO₃.

 

(4) Finally, since there are 2 atoms of K in each molecule of K₂CO₃, multiply the number of molecules of K₂CO₃ by 2 to get the total number of atoms of K in 89.3 grams of K₂CO₃.

 

You should be able to work the problem from here.