A mole in chemistry is defined as the number or quantity of a chemical substance that consists of as many fundamental entities such as atoms, molecules, and ions. Therefore, the statement that best describes a mole is that, it is used for directly comparing the amounts of substances.
How do you define one mole?
The mole, symbol mol, is the SI unit of amount of substance. One mole contains exactly 6.022 140 76 × 1023 elementary entities.
Which of these is the best definition of a mole?
A mole corresponds to the mass of a substance that contains 6.023 x 1023 particles of the substance. The mole is the SI unit for the amount of a substance. Its symbol is mol. By definition: 1 mol of carbon-12 has a mass of 12 grams and contains 6.022140857 x 1023 of carbon atoms (to 10 significant figures).
What best defines what a mole represents in chemistry?
A mole is the same as the number of molecules in a compound. … Avogadro’s number is defined as the number of atoms present in one mole of the element or the number of molecules present in one mole of the substance.
Which comparison would a teacher most likely use for describing a mole?
In a classroom, the comparison that a teacher would most likely use for describing a mole is: jar of jellybeans and a gram of salt crystals. Option C is the correct answer.
What is the difference between a mole and a molecule?
Mole and molecule are two distinct terms used in chemistry.
Difference between mole and molecule.
|Used to measure the quantity of a substance||Used to name a combination of several atoms|
|Give in the unit “mol”||Number of molecules can be measured as the number of “mol” present|
What is the importance of a mole?
The mole is important because it allows chemists to work with the subatomic world with macro world units and amounts. Atoms, molecules and formula units are very small and very difficult to work with usually. However, the mole allows a chemist to work with amounts large enough to use.
What is a mole Class 9?
The mole is the amount of substance that contains the same number of particles (atoms/ ions/ molecules/ formula units etc.) as there are atoms in exactly 12 g of carbon-12. • Mass of 1 mole of a substance is called its molar mass.
How are moles used in everyday life?
In chemistry, the mole is a unit used to talk about atoms. It is similar to other units we use everyday. For example, you might walk into the local doughnut shop and order a dozen doughnuts. In doing so, you know that you will get 12 of these snacks and the clerk knows to give you 12.
What are the two things that a mole represents?
- A mole represents two things:
- It represents a definite amount of the substance i.e. an amount of substance equal to its gram atomic mass or gram molecular mass.
- It represents a definite number (6.022 × 1023) of atoms, molecules or ions of a substance.
What are moles in Chemistry for Dummies?
A mole is a unit of measurement in chemistry. Here is the official definition: One mole of something (say, atoms, or raindrops) is equal to as many of that something as there are atoms in 12 grams of the isotope carbon-12.
How do you master mole concept?
- n = N/NA …
- Molar mass of a Substance = (Mass of the Substance in grams)/(Number of Moles) …
- Number of Moles = (Mass of the Sample)/(Molar Mass) …
- Number of Atoms or Molecules = (Number of Moles)*(6.022*1023) …
- 1 amu = (1gram)/(6.022*1023) = 1.66*10-24 grams.
How many molecules are in a mole?
Chemists generally use the mole as the unit for the number of atoms or molecules of a material. One mole (abbreviated mol) is equal to 6.022×1023 molecular entities (Avogadro’s number), and each element has a different molar mass depending on the weight of 6.022×1023 of its atoms (1 mole).
How does a mole of magnesium compare with a mole of iron?
How does a mole of magnesium compare with a mole of iron? They both have the same number of atoms.
Which statement best describes a mole it is 12 units of a given substance?
Answer : The correct option is, It contains particles of a given substance. Explanation : According to the mole concept, one mole of a substance contains number of particles of a given substance. Hence, the correct option is, It contains particles of a given substance.
Which must be the same when comparing 1 mol?
Explanation : When comparing 1 mol of oxygen gas with 1 mol of carbon monoxide the number of molecules must be same. Each mole should contains in it. Irrespective of the weight or atomic number avogadro’s number remains constant for every mole of atom.