binding help?

so i want to bind impulse 200 in black mesa but i cant. i no impulse 200 works cause i have typed to make shure.but when i type bind q impulse 200 it wont work cause theres a space.is there any other way i can make impulse 200 have a hotkey?

Are you putting quotation marks around impulse 200? If a command has a space then it needs to be in quotes.
Example:

bind T “impulse 101” (Requires quotes as there’s a space in the command.)
bind O buildcubemaps (No spaces, no quotes required.)

This goes for every Source game, by the way.

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.