Depends how thick the paper is, and how large a sheet is.
100g
3.2 ounces
how can I put weight in my paper plane
A4 is an indicator of size, typically for paper, not of weight. Weight will vary by the material or paper's thickness.
Tracing paper is much more transparent (see-through) than layout. Layout is closer to regular paper.
That depends on how much paper you have - ie its size.
not much
Paper can hold exactly 4.5 kg
Depends how thick the paper is, and how large a sheet is.
It would be more appropriate to ask "How much paper" as paper is typically measured by weight or volume, rather than in countable units.
It weighs at least 0.0001g
100g
3.2 ounces
none, paper towels don't lift weights
4.5 kgDepends
.86 grams