Question

How many molecules are in 257 grams of chlorine (Cl2)? Show your work in the space below. HELPPPP

Answer 1

2.2 × 10^24 molecules

Step-by-step 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 (
`Cl_2`) =
`35.453 * 2` = 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 =
`(257)/(70.906)` = 3.62 moles

We know that,
`1mol = 6.022 * 10^(23)`

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 =
`3.62 * 6.022 * 10^(23)` = 2.2 × 10^24 molecules