How many molecules are in 257 grams of chlorine (cl2)? show your work in the space below.

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 () = = 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 = = 3.62 moles

We know that,

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 = = 2.2 × 10^24 molecules