Probably the same as a fistful of normal matter. Note that just like normal matter comes in different varieties, so could antimatter, in principle - that is, you could have anti-hydrogen, anti-water, anti-lead, etc. So, I would expect a fistful of anti-lead to weigh as much as a fistful of normal lead, a fistful of anti-lithium to weigh as much as a fistful of normal lithium, etc.
42
1000 pennies would weigh approximately 2.5 pounds.
You would weigh 102 lb.
If you weigh 100lbs you will weigh 88lbs on Venus
it would weigh as much as your stupidity.
It may have to do with the way the universe was created. Certainly if there was a lot of antimatter created, much of it may well have come in contact with matter through the billions of years the universe has existed. That would have resulted in the conversion of that antimatter (along with a like amount of matter) into energy. There may not have been much antimatter around to begin with, too. But, since the amount of visible matter represents less matter than has been calculated to exist in the uinverse, it may be that there is a good bit of antimatter out there somewhere. Not likely, but possible.
How much a UFO would weigh if they do indeed exist is not known.
You would weigh about 1/6 as much on the moon as you weigh on earth if you were not wearing heavy equipment. I would weigh about 560 ounces on the moon.
It would be antimatter, and a sample of it (as much of a waste as that would be) should annihiliate on contact with matter, releasing some amount of energy.
330 lbs.
It would weigh 10kg.
A gnu would probably weigh 300-450 pounds.