Sounds like you have more homework to do. Have no idea if 2 lbs of charcoal is enough for your size tent. How much charcoal to use depends on tent size, how much loss of CO through tent fabric, seams, vents, etc. The amount of charcoal to use is .135 kg/m³. To use calculate how much charcoal to use with that guideline, you need to know the volume of your tent (L x W x H; which is close enough for computational purposes because it will result in a volume actually larger than your tent because it doesn't take into account the "domed" shape, hence it builds in an inherent safety factor). That info is all in the CO Megathread. Even when you get to a final calculation for how much charcoal to use, you should still then triple or quadruple the amount for more assurance that you're using enough. What kind of charcoal are you using? What amount of time should elapse after lighting the charcoal and placing them in the tent? Once charcoal is placed in the tent, how much more time should pass to allow the CO to build up to an adequate level before getting in the tent? How will you know if the CO level is high enough to cause a (relatively) peaceful, quick, assured death? Yes, it sounds like you have a lot of homework yet to be done.