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Answered 2011-03-20 04:30:19

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

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


convert to liters, then multiply by density of substance. with the grams, use the moles=mass/molar mass to find moles



To convert mass to moles, you use the equation n= m/M n is moles, m is mass, M= Molar mass, which is the mass of the atoms in the formula or substance.


This formula is: moles = mass of the compound/molar mass of the componnd


mass (g) ------------------- = moles molar mass (amu) For example: If you have five grams of NH3 , how many moles of the substance do you have? Answer: Molar mass of NH3 = 17.01 (approx) 5g ------------ = 0.294 moles 17.01 amu a+ =207.2


To convert grams into atoms, you have to convert them into moles first. Get the molar mass and multiply it by the number of moles to get the atoms.


The mole is the molar mass of a compound in grams.


The molar mass of a compound is expressed in grams.


#moles = mass/molar mass mass = #moles*molar mass mass = .10 moles*(atomic weight of na+atomic weight of N+3(atomic weight of oxygen)


Use the molar mass of an element or compound to convert between the mass of a substance and the moles of a substance. Mass(GRAMS)=number of moles x mass(GRAMS)/1 MOLE


Divide grams by the molar mass of the substance.


the molar mass is used as a conversion factor to convert grams to moles




II. CHANGING NUMBER OF MOLES TO MASS If we are given the number of moles of a substance, we can convert that into a mass, based on our knowledge of Molar mass. We can use the formula from the section above, and adjust it for the new unknown, which will be mass of the sample: mass of the sample# of moles of the substance = ---------------------------Molar mass of substance To isolate the mass of the sample, we must multiply both sides by Molar mass of a substance: mass of the sample x Molar mass of substance# of moles of the substance x Molar mass of substance = ---------------------------Molar mass of substance So we are left with the formula: mass of the sample = # of moles of the substance x Molar mass of the substance. Example 1. A certain laboratory procedure requires the use of 0.100 moles of magnesium. How many grams of magnesium would you mass out on the balance? Solution, from the period table we get the Molar mass of magnesium as 24.3 g. We then place that information in the formula below: mass of the sample = # of moles of the substance x Molar mass of the substance. Given: The # of moles of the substance = 0.100 molThe Molar mass of the substance = 24.3 g/mol mass of the sample = 0.100 mol of magnesium x 24.3 g/mol


You need to know the molar mass of the compound. 1 mol is equal to molar mass in g.


Calculate:mass/molar mass = moles


Multiply molar mass (gram per mole) of a compound with the number of moles of that compound to find the mass (in grams)


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


Since molar mass of hydrogen is 1g , the no. of moles = mass of hydrogen given. or No. of moles= Given mass of substance/Molar mass of substance


Each compound has a specific molar mass; no conversion.


molar mass =207.2 g / mol no. moles = mass/ molar mass moles = 1 1(207.2) = mass mass of 1 mole lead is 207.2g molar mass =207.2 g / mol no. moles = mass/ molar mass moles = 1 1(207.2) = mass mass of 1 mole lead is 207.2g


In order to convert an element's mass to moles, you must use the molar mass (either 1 mole/ ___g or ___g/ 1 mole). For example, when converting 300g or Hydrogen gas to moles, you must multiply that initial amount by the molar mass of H2. So 300g H2 (1mol/ 2gH2) = 150 mol H2.


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.