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Answered 2012-12-07 18:12:01

By dividing the total mass of the number of moles that you are considering by number of moles; the result is the molar mass.

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number of moles=molar mass/sample mass


To calculate the number of moles from a known mass, divide the mass (in grams) by the molar mass (in grams per mole) of that particular compound.


To calculate molar mass, you use the following formula.Molar Mass = Given mass / number of moles.For example if you are given that there is 85 gram of ammonia and it is 5 moles. Then Molar Mass = 85/5 = 17 g.


The formula is:number of moles = mass of the gas/molar mass


Calculate:mass/molar mass = moles


Iron chloride has a molar mass of 162 grams per mole. To find the number of moles, divide the mass of the sample by the molar mass.



Molar mass of iron is 56g. Given mass of iron= 112g No. of moles = Given mass/Molar Mass => 112g/56g= 2 moles


To calculate the number of moles in a substance, divide the number of atoms or molecules by Avogadro's number (6.022 E23). Alternately, divide the mass of the substance by its molar mass.


The molar mass of benzonitrile is 103,12 g .


molar mass is the atomic mass of the element. it's on the Periodic Table. you just have to add them up. unless you want to calculate the number of moles in a compound, in that case: moles = mass/molar mass


Divide the mass (grams) by the molar mass (grams per mol)


Number of moles = Total mass/Molar mass


To calculate the number of moles from grams, you must divide by the substance's molar mass


Given mass divided by moles of molecules.



The molarity is a form of expression for the concentration; the molarity of a solution is the number of moles of solute in the solvent. The number of moles is the ratio between the mass of the solute in the solution and and its molar mass.


Molar mass is irrelevant. Number of moles is equal to number of atoms divided by Avagadro's number


You will need to specify the mass of C6H6 in order to calculate a number of moles. If you know the mass, the general formula is:n=m/M, where n is the number of moles, m the mass of C6H6 and M the molar mass (78.11g/moles)


The number of moles is mass in g/molar mass in g.


Conversion of a certain mass of a substance to moles requires knowing the molar mass. Molar mass is given in grams per mole. Dividing the known mass by the molar mass gives the number of moles.


to convert mass into moles you divide by the molar mass. You cannot convert molar mass directly to moles.


No. of moles= Given mass of substance/Molar mass of substance. No. of moles of carbon dioxide in 33 grams= 33/44=0.75 moles


number of moles = mass of the substance/molar mass of the substance


The molar mass of carbon dioxide is 44,01 g.Number of moles = mass of CO2/molar mass.



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