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Jul 29, 2021 · For an element, the molar mass is the mass of 1 mol of atoms of that element; for a covalent molecular compound, it is the mass of 1 mol of molecules of that compound; for an ionic compound, it is the mass of 1 mol of formula units.
In chemistry, the molar mass (M) of a chemical compound is defined as the ratio between the mass and the amount of substance (measured in moles) of any sample of the compound. The molar mass is a bulk, not molecular, property of a substance.
- M
- g/mol
- M N−1
- kg/mol
The molar mass of a compound defines the mass of 1 mole of that particular substance and number of grams per mole of a compound. Molar mass can be calculated if the number of atoms and the atomic weight of the element is known.
Learn how to find the molar mass of a substance by summing the molar masses of its component atoms, and how to use it to convert between mass and number of moles. Watch a video example and see comments and questions from other learners.
- 6 min
- Sal Khan
- Is molar mass the same as molecular mass, or do they differ? In some websites they say it's differen...They are not the same thing but many people use the terms incorrectly Atomic mass and molecular mass should be in units of u (unified atomic mass u...
- I don't understand how Sal finds the molar mass is there an easier way or a formula to follow to cal...The molar mass of any element is on the periodic table. For a molecule or compound, simply add up all the molar masses of the elements, taking subs...
- I don't understand finding the significant figures at the end of the example. What are significant f...The basic idea is that your answer to a calculation shouldn’t have more significant figures than the initial quantity given has. The initial quanti...
- why we say NaCl or KCl always why we don't say ClNa or ClK instead.Traditionally, the most electronegative element is written last. However, there is no harm in writing ClNa, just as long as you know that chlorine...
- How would you solve something like: What is the mass of 3.5 mol of FeCl2 and What is the mass of 5 x...First, you can calculate the molar mass of FeCl2 by adding the molar masses of Fe (55.845 g/mol) and 2 atoms of Cl (2 times (35.446 g/mol). This gi...
- At 3:20 why did Sal write 180.16, as the answer was 180.156, why didn't he write 180.15?It's important to keep in mind significant figures are important for doing calculations in a science like chemistry. After a calculation would be a...
- at 0:42,molar mass is equal to mass per mole? Like molar mass of *H* in gram is 1 gm/1 mole ?This is true! This is the case because 1 mole of a molecule is equal to 6.02214076×10^23 (avogadros constant) individual molecules. Avogadros const...
- How come at 1:57 the hydrogen is the only element not rounded off to the 2nd decimal point?It is probably because the atomic mass of hydrogen is so small that the extra precision makes a more significant difference when doing calculations...
- I don't really understand where the 1000 came fromThe question says it’s a 1.52 kg sample of glucose. In order to use the molar mass of glucose (~180 g/mol), the 1.52 kg needs to be converted into...
- why doesn't Sal just divide 1.52 kg by the atomic mass of an single glucose atom?If you follow the maths of the units, it doesn’t yield mols as the answer. 1.52 kg is the total mass of the sample. And since glucose is a molecule...
Calculate the molar mass of an element or compound. Determine the number of atoms, formula units, or molecules in one mole of a substance. Molar Mass of an Element. According to the periodic table , the atomic mass of aluminum is 26.98 amu, copper is 63.55 amu, and carbon is 12.01 amu.
Aug 17, 2022 · Learn the definition and formula of molar mass, the mass in grams per mole of a substance. See examples of how to calculate molar mass for elements, compounds and mixtures.
3: Stoichiometry. 3.3: Molar Mass. Expand/collapse global location. 3.3: Molar Mass. Page ID. Mass is a basic physical property of matter. The mass of an atom or a molecule is referred to as the atomic mass. The atomic mass is used to find the average mass of elements and molecules and to solve stoichiometry problems. Introduction.
