Final answer:
To find the number of moles in a given quantity of molecules, we can use Avogadro's number and the molar mass. The number of moles in 9.55E23 molecules of oxygen gas is 1.587 mol.
Step-by-step explanation:
To find the number of moles in a given quantity of molecules, we can use Avogadro's number and the molar mass. Avogadro's number, which is approximately 6.022 x 10^23, represents the number of particles in one mole of a substance. The molar mass of oxygen gas (O2) is approximately 32 g/mol.
Using these values, we can set up a conversion factor to find the number of moles:
9.55E23 molecules of O2 x (1 mol O2 / 6.022 x 10^23 molecules O2) = 9.55E23 / 6.022 x 10^23 = 1.587 mol