you cannot work out weight to length without knowing the density and the shape, and up to two other dimensions of the shape
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To convert milligrams (mg) of urea to millimoles (mmol) of urea, you need to know the molar mass of urea, which is 60.06 g/mol. Divide the mass in mg by the molar mass to get the amount in millimoles. For example, to convert 100 mg of urea to mmol, you would divide 100 mg by 60.06 g/mol to get approximately 1.67 mmol of urea.
The answer is 0,02552 mmol.
Molar mass Fe is 55.845 mg/mmol, so 125 mg represents 125 / 55.845 = 2.238 mmol Fe.Since the molar mass of (NH4)2Fe(SO4)2·6H2O is 392.13 g/mol, 2.238 mmol of this Mohr's salt weights 392.13(mg/mmol) * 2.238 mmol = 878 mg Mohr's salt.This has to be dissolved in 1.00 L water to give the desired 125 ppm (=mg/L) Fe2+ solution
To convert grams (g) to millimoles per liter (mmol/L) for a substance, you need to know the molar mass of the substance. Then you can use the formula: Concentration in mmol/L = (mass in g) / (molar mass in g/mol) * 1000.
The normal range for serum urea is typically between 7-20 mg/dL (2.5-7.1 mmol/L). However, this range can vary depending on the laboratory and individual factors such as age and health status. It is important to interpret the results in the context of the specific clinical situation.
A urea level of 8.0 mmol/L in the blood may indicate impaired kidney function. It is above the normal range (2.5-7.1 mmol/L) and could be a sign of renal dysfunction or dehydration. Further evaluation by a healthcare provider is necessary to determine the cause and appropriate treatment.