The number of moles of chlorine gas that contain the same number of atoms as there are in 16 g of helium is 35.44 moles.
The number of moles of a substance can be calculated using the formula: n = m/M, where n is the number of moles, m is the mass of the substance, and M is the molar mass of the substance.
In this case, we are trying to find the number of moles of chlorine gas that contain the same number of atoms as there are in 16 g of helium. The molar mass of helium is 4 g/mol, so the number of moles of helium is 16 g / 4 g/mol = 4 moles.
Since the atomic weight of chlorine is 35.45 g/mol and the atomic weight of helium is 4 g/mol, it follows that there are 35.45 g/4 g = 8.86 atoms of chlorine in 1 mole of chlorine gas.
Therefore, the number of moles of chlorine gas that contain the same number of atoms as there are in 16 g of helium is 4 moles * 8.86 atoms/mole = 35.44 moles.