Gram Molecular Mass vs Molar Mass: Explained

In summary, gram molecular mass and molar mass are two different measurements used in chemistry. Gram molecular mass refers to the mass of one molecule of a substance in grams, while molar mass refers to the mass of one mole of a substance. They are calculated differently, with gram molecular mass being the sum of atomic masses in a molecule and molar mass being the product of atomic mass and the number of atoms in a molecule. It is important to know these values for accurate measurements and understanding the properties of a substance. While there is a direct relationship between the two, they cannot be used interchangeably as they serve different purposes in chemistry.
  • #1
Ry122
565
2
What is the difference between gram molecular mass and the molar mass?
My book says that the gram molecular mass of oxygen is 32 grams and the molar mass is 16. Since a mole is equal to the gram molecular mass shouldn't they be the same?
 
Physics news on Phys.org
  • #2
molecular mass of oxygen as a molecule is 32 grams because it is O_2. The molar mass is 16 grams for oxygen atom.
 
  • #3
What is O_2?
 
  • #4
O_2 is a molecule consisting of two O atoms.
 

1. What is the difference between gram molecular mass and molar mass?

Gram molecular mass, also known as molecular weight, is the mass of one molecule of a substance in grams. Molar mass is the mass of one mole of a substance in grams. One mole is defined as the amount of a substance that contains 6.02 x 10^23 particles, which is known as Avogadro's number.

2. How are gram molecular mass and molar mass calculated?

Gram molecular mass is calculated by adding together the atomic masses of each atom in a molecule. Molar mass is calculated by multiplying the atomic mass of an element by the number of atoms present in one molecule, and then adding together the molar masses of each element in the molecule.

3. Why is it important to know the gram molecular mass and molar mass of a substance?

Knowing the gram molecular mass and molar mass of a substance is important for various reasons. It is necessary for accurately measuring and calculating the amount of a substance in a reaction. It also helps in determining the concentration of a solution and understanding the properties of a substance.

4. Is there a relationship between gram molecular mass and molar mass?

Yes, there is a direct relationship between gram molecular mass and molar mass. Gram molecular mass is a specific type of molar mass, as it refers to the mass of one molecule while molar mass refers to the mass of one mole of a substance. Both values are expressed in grams and are used in different calculations in chemistry.

5. Can gram molecular mass and molar mass be used interchangeably?

No, gram molecular mass and molar mass cannot be used interchangeably. They are two different measurements and are used for different purposes. Gram molecular mass is used to calculate the amount of a substance in a reaction, while molar mass is used to calculate the concentration of a solution and other properties of a substance.

Similar threads

  • Introductory Physics Homework Help
Replies
6
Views
1K
Replies
2
Views
865
  • Introductory Physics Homework Help
Replies
1
Views
1K
  • Biology and Chemistry Homework Help
Replies
10
Views
2K
  • Mechanical Engineering
Replies
2
Views
177
Replies
6
Views
2K
  • Biology and Chemistry Homework Help
Replies
4
Views
1K
  • Introductory Physics Homework Help
Replies
8
Views
846
  • Introductory Physics Homework Help
Replies
13
Views
3K
  • Introductory Physics Homework Help
Replies
10
Views
887
Back
Top