Answer:
2.2 × 10^24 molecules
Explanation:
First of all, we need to know the molar mass of chlorine which can be found by using its atomic mass.
molar mass of Chlorine ([tex]Cl_2[/tex]) = [tex]35.453 \times 2[/tex] = 70.906 g/mol
It means that one mole of Chlorine has a mass of 70.906 g.
Number of moles present in 257 grams sample = [tex]\frac{257}{70.906}[/tex] = 3.62 moles
We know that, [tex]1mol = 6.022 \times 10^{23}[/tex]
So we will multiply the number of moles present in 257 grams of Chlorine with this number to find the number of molecules.
Number of molecules in 257 grams of Chlorine = [tex]3.62 \times 6.022 \times 10^{23}[/tex] = 2.2 × 10^24 molecules
