Don't toss the powder. You can fertilize grass with it or it will also melt ice and snow.
I wish people would stop saying that smokeless is a good fertilizer.
All it will do is chemically burn what ever plant or grass you put it on.Plus it is a tiny amount, Even if it was a good source of Nitrogen it would not do more than a square inch or so of "grass"
But as a rule of thumb, your lawn needs no more than one pound of nitrogen per 1000 square feet.
Put it in a little pile and ignite it tonight. !