Snorting 1mg of alprazolam will have the same effect as swallowing 1mg of alprazolam (most likely it will not absorb in the nose).
You may feel drowsy, clumsy and/or relaxed. Don't expect too much from it. It is very common for those who are new to benzos to keep on popping them because they are not getting a satisfying high from them. While they are very nice to have on hand, many people do not find them recreational (on their own), myself included. Xanax is a godsend if you are having a panic attack, and they are very nice to counteract the side effects and lingering insomnia from stimulants/hallucinogens. Some people use them to intensify the effects of opioids but this is potentially deadly, it greatly increases the risk of OD as both drugs depress breathing. Also, benzos are notorious for tricking you into believing that you are not as impaired as you actually are (i.e. you may think your not that messed up so you take some more pills, but come tomorrow, you'll realize you were trashed. likely you won't remember much and people will tell you ridiculous things you have said and done).
So what I'm trying to say is: stick with 1mg your first time even if you feel disappointed and compelled to take more. You can take more next time, but you can't take less after you've already taken it.
good luck.