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It's good manners to use quote tags if you quote from someone else. ^^^^^
As piglet says, you have misunderstood me.
An item weighing 12 Daltons (i.e. a Carbon 12 atom) has a molar mass of 12 grammes per mole. This does not mean that 1 Dalton = 1 gramme per mole.
It means that a Dalton is one AMU, and if you get 1 mole of C12 atoms (Avogadro's Number) it will weigh 12 grammes.
Your original question tells you that your molecule is equal to 5kDa, and 1.3 g/cm^3.
You know that 1 mole of your molecule will weigh 5 kg, and occupy (5,000/1.3)cm^3.
This equals ~3,000 cm^3
Devide this by Avogadro's number to get the volume of a single molecule (assuming the molecules are packed in such a way as to perfectly fill 100% of the space).
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
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And everthing is Green and Submarine
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