Final answer:
In 3.36 g of oxygen, there are approximately 6.3231 × 1022 oxygen molecules. This calculation is based on the molar mass of oxygen gas and Avogadro's number.
Step-by-step explanation:
To calculate the number of oxygen molecules in 3.36 g of oxygen, we first need to determine the number of moles of oxygen in that mass. The molar mass of oxygen gas (O2) is approximately 32 g/mol. To find the moles, we divide the mass of the oxygen by its molar mass:
Number of moles = mass (g) / molar mass (g/mol) = 3.36 g / 32 g/mol = 0.105 mol.
Since one mole of any substance contains Avogadro's number (6.022 × 1023) of molecules, we can now find the number of molecules:
Number of molecules = number of moles × Avogadro's number = 0.105 mol × 6.022 × 1023 molecules/mol.
Therefore, in 3.36 g of oxygen, there are approximately 6.3231 × 1022 oxygen molecules.