Question

You weigh out 43.9 g of potassium (K). How many moles of potassium did you weigh? How many atoms?

Answer 1

1.12 moles of potassium

6.76x10²³ atoms of potassium

Step-by-step explanation:

In order to convert g of potassium to moles, we need to use its molar mass (which we can find via the periodic table):

• Molar Mass of K = 39.09 g/mol

• 43.9 g K ÷ 39.09 g/mol = 1.12 mol K

Then, to convert moles into atoms, we use Avogadro's number (6.023x10²³ atoms per mole):

• 1.12 mol K * 6.023x10²³
  `(atoms)/(mol)` = 6.76x10²³ K atoms