Calculate the number of molecules in 4.00g of oxygen
To calculate the number of molecules in 4.00g of oxygen, we first need to determine the number of moles of oxygen in 4.00g using the molar mass of oxygen.
The molar mass of oxygen (O2) is 32.00 g/mol.
Number of moles = mass / molar mass
Number of moles = 4.00g / 32.00 g/mol
Number of moles = 0.125 mol
Now, we need to convert the number of moles to the number of molecules using Avogadro's number.
1 mol of any substance contains 6.022 x 10^23 molecules.
Number of molecules = number of moles x Avogadro's number
Number of molecules = 0.125 mol x 6.022 x 10^23 molecules/mol
Number of molecules = 7.5275 x 10^22 molecules
Therefore, there are approximately 7.53 x 10^22 molecules of oxygen in 4.00g of oxygen.