To find the mass of 8.07 x 10^24 molecules of O2, we need to determine the molar mass of O2 and then convert the number of molecules to moles. Finally, we can calculate the mass by multiplying the number of moles by the molar mass.
The first step to finding the mass of 8.07 x 10^24 molecules of O2 is to determine the molar mass of O2. The molar mass of O2 is 32 g/mol.
Next, we need to convert the given number of molecules to moles. To do this, we divide the given number of molecules by Avogadro's number, which is 6.022 x 10^23.
Finally, we can calculate the mass by multiplying the number of moles by the molar mass.
Mass = number of moles x molar mass = (8.07 x 10^24 molecules / 6.022 x 10^23 molecules/mol) x 32 g/mol = 426.37 g.