What would you like to do?

How do you convert from grams to moles and also from moles to grams?

already exists.

Would you like to merge this question into it?

already exists as an alternate of this question.

Would you like to make it the primary and merge this question into it?

exists and is an alternate of .

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.
+ 151 others found this useful
Thanks for the feedback!

How do you convert 2.9 grams to moles?

You divide by the molecular weight. This can be found  on the periodic table by adding the atomic masses. (It's units are  already grams per mole). 

Convert 1.3 moles of calcium to grams?

52.1grams. moles = mass (in grams)/RMM (relative molecular mass) 1.3 moles = mass (in grams)/ 40.078 mass = 40.078 x 1.3 = 52.1grams

How do you convert 12 grams of oxygen into moles?

Divide by its molecular weight. however if it is a gas it is O2 and therefore it's molecular mass is 32, not 16. so 12/32 gives you the amount of moles

How do you convert moles per liter into grams per liter?

Since both of them are per liter....then all you need to do is a one step conversion of moles into grams using the molar mass...essentially you are going to multiply the mol/L

How do you convert moles to grams and grams to moles?

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 M

Convert 125 grams of calcium to moles?

For this you need the atomic mass of Ca. Take the number of grams and divide it by the atomic mass. Multiply by one mole for units to cancel. 125 grams Ca / (40.1 grams) =

Grams per liter into moles per liter how to convert?

divide by the molecular mass, (units of gram per mol)
In Science

How do you convert moles into 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 Mol
In Science

How do you convert moles to gram moles?

  Chemical Engineers sometimes measure substance amount in units of gram-moles, kilogram-moles, pound-moles, or ounce-moles; these measure the quantity of a substance whos

Convert 14 moles of caBr2 to grams?

  1st you must find the molar mass of CaBr2. Ca 40.08g * (number of moles in the compound) 1 Br 79.90g * 2 This give you the amount (g) in 1 mole of CaBr2. Multipl