0
How do you calculate the number of moles when given the mass of a compound?
Wiki User
∙ 10y ago
I assume you mean that you know what molecule it is, and how many grams of the substance you have, and want to know how many moles of the molecule you have.
1. Count how many atoms of each chemical element are present in the molecule.
2. Use a list of atom weights to find out the atom weight of each of the present atoms, i.e. the mole weight for every atom.
3. Add together the mole weight of the atoms in the molecule. This is the molecule weight.
4. Divide the weight of the substance you have with the molecule weight, and you will get the number of moles.
Example: I have 500.0 g of ethanol. How many moles is that?
1. The chemical formula of ethanol is C2H5OH, so every molecule consists of two carbon atoms, six hydrogen atoms and one oxygen atom.
2. I use a book to look up the atom weights, and find out that the following:
Carbon weighs 12.01 g/mole
Hydrogen weighs 1.008 g/mole
Oxygen weighs 16.00 g/mole
3. (2 * 12.01) + (6 * 1.008) + (1 * 16.00) = 46.068
4. 500.0 g / 46.068 g/mole = 10.85 moles
Wiki User
∙ 16y ago
Wiki User
∙ 11y agoMolar mass is irrelevant. Number of moles is equal to number of atoms divided by Avagadro's number
Wiki User
∙ 10y agodivide mass by the molar mass of the compound.
Wiki User
∙ 8y agoTo 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.
Wiki User
∙ 8y agoNumber of moles = mass of a compound/molar mass
Add your answer:
Earn +20 pts
Calculate the number of moles in 2400g of Co2?
54.54 moles
What is the number of moles represented by 38.1g?
This depends on the compound !
How do you calculate the moles of water?
You use the formula concentration x volume to find out the number of moles
Calculate the number of molecules in 8.0 moles of CH?
CH is not a molecule.
Can you calculate the number of molecules in 8.0 moles of CH?
CH is not a molecule.
Calculate the number of moles in 112 g of iron?
Molar mass of iron is 56g. Given mass of iron= 112g No. of moles = Given mass/Molar Mass => 112g/56g= 2 moles
How many moles in NaCHO3?
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.
How do you work out the number of moles of unknown compound if you are only given the molar mass?
The molar mass of any compound contain a number of molecules equal to the number of Avogadro:6,022 140 857(74).10e+23.
How do you calculate moles from molarity?
Number of Moles = concentration * volume (in litres)
Calculate the number of moles in 2400g of Co2?
54.54 moles
calculate the number of moles in H2 molecules in 4g H2?
2 moles.
What is the number of moles represented by 38.1g?
This depends on the compound !
How do you calculate the moles of water?
You use the formula concentration x volume to find out the number of moles
How is a mass of a compound determined the number of moles?
The molar mass of a compound is equal to 1 mol.
How do you find the number of carbon moles in cholesterol c27h46o?
The number of atoms of an element in a molecule is the number subscript immediately following the element symbol in the formula for the molecule. The number of moles of anything in a compound depends on the amount of the compound, which is not stated.
What are the steps for calculating molar mass of compound?
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
How do you calculate the molar mass of ammonia?
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.
