Multiply the number of moles times the molar mass of the compound. Moles cancel and you are left with mass in grams.
For example: What is the mass of 2.47 moles of sodium chloride, NaCl?
Known: The molar mass of NaCl is 58.44g/mol. (Using atomic weights in grams from the Periodic Table.)
Solution:
2.47mol NaCl x 58.44g/mol NaCl = 144g NaCl
The number of moles is mass in g/molar mass in g.
number of moles = mass of the material/molar mass
The molar mass is 20 g.
If grams/molar mass=moles, then first the molar mass of the compound must be found. CaCl2 has a molar mass of 110.984. Divide the number of grams, 15.5, by 110.984, and you get the number of moles. Now, seeing as calcium is not diatomic like oxygen or chlorine, there needs to be no conversion between the number of moles of calcium in the compound and the number of moles of calcium outside of the compound. atoms, the number of calcium atoms in the compound divided by one mole of the compound will give us the ratio. Conveniently enough, that ratio is one calcium atom per molecule of calcium chloride, meaning that for every one mole of calcium chloride, 1 mole of pure calcium can be extracted. So once you find the number of mole of CaCl2, that is the number of moles of calcium as well. This may be a little difficult to grasp, but I'm sure that your teacher, if you're a student, will be able to explain why rather well.
First, C2F3Cl3 has a molar mass of 187.38 g/mole. So there are 117.41 moles of this compound. By ratio, then there are 352.23 moles of chlorine. Chlorine has a molar mass of 35.453 g/mole, so there are 12.488 kg of chlorine in that compound. CF3Cl has a molar mass of 104.46 g/mol = 210.61 moles. By ratio, there are an equivalent number of moles of chlorine, so there is 7.467 kg of chlorine in the second compound.
The molar mass of a compound is equal to 1 mol.
1 mol is equivalent to the molar mass of a compound, in grams.
Number of moles = Total mass/Molar mass
The number of moles is mass in g/molar mass in g.
the molar mass is used as a conversion factor to convert grams to moles
number of moles = mass of the material/molar mass
The molar mass is the measurement of mass per one mole of a substance. If the mass of a matter is known, divide it from the molar mass to obtain the number of moles.
The molar mass is the measurement of mass per one mole of a substance. If the mass of a matter is known, divide it from the molar mass to obtain the number of moles.
The molar mass of any compound contain a number of molecules equal to the number of Avogadro:6,022 140 857(74).10e+23.
Moles = Mass (g) x Molar mass (g)
A mole is a defined number of atoms/molecules of an element/compound. Therefore, the number of moles of NaCHO3 will depend on the mass of NaCHO3 that you have. To calculate the number of moles in a known sample, divide the mass of the sample (in grams) by the molecular weight.
The number of moles in the equation of B DIVIDED BY the number of moles in the equation of A ANSWER TIMES the molar mass of B OVER 1. A is the the known compound, B is the one your trying to find out.