Not enough information to answer, too many variables.
it can hold as much weight as it can handle
That depends upon the size of the joists & grade/species of wood
wood, metal, plastic, cheddar, matchsticks it really depends on how much weight you want it to hold
That would depend on the specie of wood that the 2x8 is made from.
The weight limit of a queen platform bed drawer depends on what the drawer is made from. If it is made from a sturdy wood, it would be able to hold a fair amount of weight, but if it is made from particle board or a cheap material, it will likely not hold much weight at all.
it can't hold very much weight
The Staples large mahogany desk can hold up to 100 lbs., but can probably hold much more owing to its solid wood design.
Please consider all types of furniture before purchasing the wood chairs. Wrought iron or certain types of aluminum are actually stronger than wood and will not rot.
20 times its weight in liquid
112lbs
The weight of water displaced by the floating block of wood is exactly equal to the weight of the ENTIRE block of wood, regardless of how much of the wood is above the water level.
There is effectively no limit to the amount of weight that aluminum can hold, if you use enough aluminum.