Here is the solution:
26.5L H2 x 1 mol H2/22.4L H2(g) x 2 mol HCl/1mol H2 x 1L HCl(g)/1.65 mol HCl = 1.43L HCl
I actually derived this solution myself, but incorrectly reasoned that it must have been wrong. It didn't make sense to me that 1.43L of HCl could produce 26.5L of H2 gas. When I see the 2:1 ratio of HCl to H2 in the chemical equation, it's hard to see how so little HCL gas can produce so much H2 gas. I might be able to figure it out when I'm feeling less burnt out, but I'd like to understand this. (Aiming for mastery here.)