A double-edged stainless steel can float on water. Without surface tension, the blade would sink because its weight is greater than its buoyant surface.
Answer: The blade doesn't sink because of the surface tension of the water.
1 mol --- 22,4 dm³
2,1 mol --- X
X = 2,1×22,4
X = 47,04 dm³ = 47,04 L
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Was there suppose to be a picture included?
I think that work is being done on the books because they are being moved to their proper location and they will be sorted properly rather than lying on a table. Without lifting or carrying, you could sort the books by their genre or title name on the bookshelf so it will be sorted much more efficiently.
I’m not sure if this is the answer you are looking for but I hope it helps :)