The molecular weight is found by adding the atomic masses of all of the atoms that form the molecule. Example: sulfuric acid, H2SO4:
H 1.01 x 2 = 2.02
S 32.07 x 1 = 32.07
O 16.00 x 4 = 64.00
98.07, the molecular wt of sulfuric acid
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Find the volume of the sample (Length times width times height) and multipy by the density coefficient.
1) Convert to moles. I assume mmol means minimole, so you divide by 1000. 2) Multiply the number of moles by the atomic or molecular weight. The molecular weight is different for different substances; you'll have to look it up or calculate it.
in order to calculate the mean of the sample's mean and also to calculate the standard deviation of the sample's
We would need to know what sample you are referring to in order to answer this question.
Count up the number of obseravtions made on the experimental units. That is the sample size.