Molecular weight of Hcl

What is Hcl ???? If you mean HCl then the moleculart mass/weight is

H = 1

Cl = 35.5

HCl = 1 + 35.5 = 36.5

NB When writing chemical formula, single letter elemental symbols are ALWAYS a CAPITAL letter ; hydrogen as 'H' ,as given

However, Two letter elemental symbols are Always written ; first letter is a CAPITAL letter and the second letter is always 'lower' case' ; Hence Chlorine 'cl' shoukld be 'Cl'.

This is the recognised international standard, and as found in the Periodic Table.