Depends what kind of powder.
The answer to your question depends on the weight to volume ratio of the powder in question. Since this powder could be anything from gunpowder to talcum powder, it is impossible to give you a clear answer. Because teaspoons measure volume not weight. If instead of a half pound of powder you said a quart of powder then a clear answer could be given, since quart and teaspoons both measure volume and not weight.
That is 48 teaspoons
About 1/12 of a teaspoon.
20.34 teaspoons will make 50 grams of powder.
There are 6 teaspoons in one ounce of garlic powder.
102.6, to my best calculation. density of baking powder = 56lb/ft^3 there are 5745 teaspoons in a cubic foot, therefore: 5745/56=102.6
26.52 teaspoons
About 7 teaspoons.
Depends WHAT kind of powder
6 half teaspoons is a tablespoon
1 pound of water is 96 teaspoons.
20 teaspoons