How many molecules are there in a 3.46 g sample of hydrogen chloride, HCl?
Note: The number of molecules in a sample is related to moles of compound (1 mol HCl `= 6.023 xx 10^(23)` HCl molecules). Therefore if you first convert grams HCl to moles, then you can convert moles to number of molecules).

Explanation

`3.46 g "HCl" xx (1 " mol HCl")/(36.5 g "HCl")xx (6.023 xx 10^(23)" HCl molecules")/(1 " mol HCl")`
`= 5.71 xx 10^(22)` HCl molecules