How many cups of confectioners sugar are in a pound?
You're trying to compare weight and volume. It doesn't really
work properly. A pound is 16 ounces, and a cup is 8 fluid ounces,
so you would expect a pound to be 2 cups. The problem is that the
density of the sugar is a variable. If you pack the sugar into the
measuring cup, it will weigh more, thereby coming out to more than
a pound in weight.