Write a balanced equation to find the molarity of solution at the STP using stoichiometry

What is the molarity of the solution if 244 of the solution reacts with excess cadmium to produce 3.80 of gas measured at ?

Write the balanced equation to get the stoichiometry

perhaps it is Cd + 2HCl ---> CdCl2 + H2. If this is right then 2mole of HCl makes 1 mole of H2 which has a volume of 22.4L at stp. So find moles of HCl needed to make 3.80L of H2 .. Then molarity HCl = number of moles HCl/volume HCl in L

Write the balanced equation to get the stoichiometry

perhaps it is Cd + 2HCl ---> CdCl2 + H2. If this is right then 2mole of HCl makes 1 mole of H2 which has a volume of 22.4L at stp. So find moles of HCl needed to make 3.80L of H2 .. Then molarity HCl = number of moles HCl/volume HCl in L