How many molecules are in 100 grams of hcl?

There are 2.74266105043 molecules in 100 grams of HCL.

1.65 x 10^24  molecules in 100 grams of HCL

because HCL is 36.461 grams/mol

and there are 6.02 x 10^23 molecules/ mol

if you did stochiometry this is what you will get 1.65 x 10^24

hope i helped