# Questions tagged [units]

For questions about the definition and usage of units of measurement.

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### Convert daltons (Da) to molar mass (g/mol) [duplicate]

This is probably a stupid question... In converting Da to molar mass (g/mol), Since 1 Da = 1 g/mol, is it logical that 64,776 Da = 64,776 g/mol or am I missing an intermediate calculation? Thank you!
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### Uncertainty when beaker goes by 50s

I am helping my daughter do her chemistry homework and am stumped by this one. I have a beaker that seems to count by 50s. That makes uncertainty calculations awkward. What is the “next unit down”? ...
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### Problem with determining the mass value of a soil sample for gravimetric calculations [closed]

I'm having some trouble with how to determine the representative mass value of a prepared soil sample for calculating its $\ce{Cl-}$ concentration in ppm (mg/kg). Recently I carried out a gravimetric ...
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### Can someone intuitively explain the reason for the units of entropy (J/K )? [duplicate]

If entropy is just a measure of the "randomness" or "chaos" of a system, then why does it have specific units. What is the reason behind the units of entropy being J/K?
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