Answer:
1.24 × 10²⁵ molecules of oxygen gas
Step-by-step explanation:
Step 1: Given data
Moles of oxygen gas: 20.6 moles
Step 2: Calculate the number of molecules present in 20.6 moles of oxygen gas
In order to convert moles to molecules, we need a conversion factor. In this case, we will use Avogadro's number: there are 6.02 × 10²³ molecules in 1 mole of molecules.
20.6 mol × 6.02 × 10²³ molecules/1 mol = 1.24 × 10²⁵ molecules