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IU stands for International Unit and is an internationallyagreed unit of activity for some chemical. U simply stands for unit, and a nation may define...

4 µg/mL = 4000 µg/L so at least tthe denominator is right
4000 µg/L x 1 mol/178.27 g = 22.44 µmol/L = 22.44 µM...
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"Molar" or molarity is shorthand for a concentration in moles per liter (mol/L) so 50 µM means 50 µmol/L
The molecular weight is...
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Just to add that the moisture content of any sand or soil mixture can greatly increase the density, so expect wide variation with moisture content.
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"L" is the symbol for liter (litre). 1000 L = 1 m³. I think if you just make the substitution, you will be all set....
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It isn't clear exactly what form of Henry's constant the second is. I recommend the Wiki[edia article to sort out the various forms of the law:
...
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A square meter is 10^{4} cm^{2} and 180 µm is 180 x 10^{4} cm so
0.68 g/cm^{3} x 10^{4} cm^{2}/m^{2} x 180 x 10^{4} cm =122.4 g/m^{2} (or gsm)...
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At what actual temperature and pressure? Nm³ implies at "normal" temperature and pressure, usually 0 °C, 101.325 kPa. Adjust to actual with...
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You either need to know the density of the source gas or composition analysis of all its components to compute an approximate average molecular weight...
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I've never heard of anhydrous honey, so I am not 100% certain. If your honey has 18% moisture, then I assume the dry matter is 82%, so 0.82m = 20g or...
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Pico is the prefix meaning 10^{12} so 160 x 10^{12} mol/kg x 1130.3 g/mol = 181 x 10^{9} g/kg, or using prefixes, 181 ng/kg
(0.181 µg/kg, if you...
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[QUOTE=ellashine95;n86010]
The "N" in Nm³ stands for "normal." Different industries use different normal or standard...
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