You must first find the molar mass of the element or compound. Use the Periodic Table (see the link to the left of the answer). If the chemical is an element, just read off the Atomic Mass from the periodic table. If it is a compound, you must know the molecular formula, and then you find the total molar mass of the compound by adding up the atomic masses of each atom in the compound. The unit of the molar mass will be in grams per moles (g/mole)
Once you have the molar mass, you can easily convert from grams to moles, and also from moles to grams.
Number of moles = (# of grams) / (molar mass)
Number of grams = (# of moles) * (molar mass)
Here are a two examples:
Example 1:
How many moles are in 5 grams of O2?
The molar mass of O2 = 16.00 g/mole x 2 (for 2 atoms of oxygen) or 32.00 g/mole.
5 g of O2 / (32 g/mole) = 0.15625 moles
Example 2:
How many grams does 4 moles of NH3 weigh?
The molar mass of NH3 = 14.01 + (3 * 1.01) = 17.04 g/mole
4 moles * 17.04 g/mole = 68.16 grams Grams in a MoleIn chemistry a mole is considered to be Avogadro's number (6.02 x 1023)of molecules (or atoms) of a substance - so depending on the density of the substance, the mass of that amount of the substance could vary widely.
One mole of hydrogen, for example, would have a different mass than one mole of lead. The question compares two different measurements of a given substance, rather like asking "how heavy is a gallon?". The question becomes "A gallon of what"?
*On the other hand, the Eastern Mole (Scalopus aquaticus) a small, burrowing mammal, weighs between 54 and 99 grams at adult size.
To convert grams to moles simply multiply the molar mass by the number of moles.
To convert from moles to grams, you need to multiply the number of moles by the molar mass of the substance. The molar mass is the mass of one mole of the substance, which is expressed in grams per mole. This conversion allows you to relate the amount of a substance in moles to its mass in grams.
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 mol
The Molar mass of the substance = 24.3 g/mol mass of the sample = 0.100 mol of magnesium x 24.3 g/mol
MOLES TO GRAMS
Multiply the number of moles by the molar mass of the substance.
CONVERSION FACTOR
Number of moles x Molar mass
////////////////////////// 1 mol
GRAMS TO MOLES
Divide grams by the molar mass of the substance.
CONVERSION FACTOR
Mass (g) x 1 mol
/////////// molar mass
Finding Molar Mass
Number of Atoms Element A x Atomic Mass Element A (periodic table) = mass (g)
Number of Atoms Element B x Atomic Mass Element B (periodic table) = mass (g)
.. etc.
Add the mass values found above and you have molar mass.
Ex. Ba3N2 (Barium Nitride)
3 Atoms Ba x 137.33 = 411.999g
2 Atoms N x 14.0067 = 28.0134g
Molar Mass = 439.9944 (411.999 + 28.0134)
Kilograms is a unit of mass, moles is a unit of "amount of matter", which in this case means something different. Therefore you can't do a general conversion. For a specific substance, to convert from moles to grams, you just look up the molecular mass of the substance. For example: water has a molecular mass of 18; that means that one molecule has a mass of 18 amu; and one mole has a mass of 18 grams. So, you can multiply the number of moles by 18 (in this example). To convert that to kilograms, you divide by 1000.
To convert from kilograms to moles, you proceed in the opposite direction. Look up the molecular mass; multiply kilograms by 1000 to get grams; and divide by the molecular mass to get moles.
It depends on the RMM (relative molecular mass) of the molecule your dealing with.
For example if you had 2 Moles of ethene (C2H4) then you would simply multiply the number of moles by the RMM, which for ethene is approximately 28 [2C=24 +4H=28]
So just multiply the RMM (28) by the number of moles(2) which gives 56g
so 2 Moles of C2H4 weighs 56g.
1 gram carbon (1 mole C/12.01 grams) = 0.08 moles carbon ===============
To convert grams of germanium to moles of germanium, you would multiply by the reciprocal of the molar mass of germanium. The molar mass of germanium is approximately 72.63 g/mol. So, you would multiply by 1/72.63 to convert grams to moles.
To calculate the mass of 238 moles of arsenic, you would first need to determine the molar mass of arsenic, which is approximately 74.92 g/mol. Multiplying the molar mass by the number of moles gives you the mass: 238 moles * 74.92 g/mol = 17,828.96 grams of arsenic.
To find the number of Cs atoms, you need to first convert the mass of Cs into moles using the molar mass of Cs. The molar mass of Cs is approximately 132.91 g/mol. Then, using Avogadro's number (6.022 x 10^23 atoms/mol), you can calculate the number of Cs atoms in the sample.
To convert Daltons to moles, you divide the given mass in Daltons by Avogadro's number, which is 6.022 x 1023. This will give you the number of moles.
See the Related Questions to the left of this answer:"How do you convert from grams to moles and also from moles to grams?"
To convert grams of NaOH to moles, divide the given weight in grams by the molar mass of NaOH. The molar mass of NaOH is approximately 40 g/mol, so one gram of NaOH contains 1/40 = 0.025 moles.
Change it's gram weight into moles using the periodic table.
how many moles are in 95.0 gram of octane?
1 gram carbon (1 mole C/12.01 grams) = 0.08 moles carbon ===============
The answer is 3 moles.
To convert grams of germanium to moles of germanium, you would multiply by the reciprocal of the molar mass of germanium. The molar mass of germanium is approximately 72.63 g/mol. So, you would multiply by 1/72.63 to convert grams to moles.
The answer is 0,111 moles.
85.2 gram LiF sample is equivalent to 3,28 moles.
You first divide the amount of molecules by avagadros number (6.022x10^23) to find out how many moles you have. Then you find out the molecular weight of the compound. You multiply the number of moles by the molecular weight to give you your weight in grams.
To calculate the mass of 238 moles of arsenic, you would first need to determine the molar mass of arsenic, which is approximately 74.92 g/mol. Multiplying the molar mass by the number of moles gives you the mass: 238 moles * 74.92 g/mol = 17,828.96 grams of arsenic.
To convert energy transferred per gram to energy transferred per mole, you need to first calculate the molar mass of the substance in grams per mole. Then, you can use this molar mass to convert the energy transferred per gram to energy transferred per mole by multiplying or dividing accordingly.