Does 'molar mass' include an atomic weight for single atom?

Click For Summary
SUMMARY

The discussion clarifies that molar mass refers to the mass of one mole of entities, which can include atoms or molecules. For example, the molar mass of water (H2O) is 18 g/mol, indicating that 18 g of water corresponds to 1 mole of water molecules. Additionally, this mass translates to 2 moles of hydrogen atoms, as calculated using the formula n = m/M. The conversation emphasizes the distinction between atomic weight and molar mass in the context of single atoms and molecules.

PREREQUISITES
  • Understanding of molar mass and its calculation
  • Basic knowledge of chemical formulas and molecular composition
  • Familiarity with the concept of moles in chemistry
  • Ability to perform unit conversions in chemistry
NEXT STEPS
  • Study the concept of molar mass in detail using resources like "Chemistry: The Central Science" by Brown et al.
  • Learn how to calculate moles from mass using the formula n = m/M
  • Explore the differences between atomic weight and molar mass through reputable chemistry websites
  • Practice problems involving molar mass calculations for various compounds
USEFUL FOR

Chemistry students, educators, and anyone interested in understanding the relationship between molar mass, atomic weight, and molecular weight in chemical substances.

HCverma
Messages
82
Reaction score
2
Does molar mass include an atomic weight for single atom and molecular weight for molecules?
 
Chemistry news on Phys.org
I do not understand your question. Molar mass simply represent the mass of one mole of entities. These entities could be anything: atoms, molecules, whatever...
 
  • Like
Likes   Reactions: HCverma
CroSinus said:
I do not understand your question. Molar mass simply represent the mass of one mole of entities. These entities could be anything: atoms, molecules, whatever...
I got my answer. Thanks a lot.
 
For example: mass of water is given and amounts to 18 g. Calculate the number of moles for water molecules, and calculate the number of moles for hydrogen atoms.
Answer:
m (H2O) = 18 g
n (H2O) = ?
n (H) = ?
-------------------------------------

n (H2O) = m (H2O) / M(H2O) = 18 g / 18 g mol-1 = 1 mol

n (H) = m (H) / M(H) = 2 g / 1 g mol-1 = 2 mol

So, the answer is: 18 g of water contain 1 mol of water and 2 moles of hydrogen.
 

Similar threads

Gram atomic mass -- what exactly is it?
  • · Replies 6 ·
Replies
6
Views
2K
Why wasn't fluorine used as a standard for atomic mass?
  • · Replies 6 ·
Replies
6
Views
3K
How did 19th century scientists measure atomic and molecular weight?
  • · Replies 6 ·
Replies
6
Views
5K
Why do atoms want to complete their shells?
  • · Replies 6 ·
Replies
6
Views
2K
How many atoms are in a given mass of metal?
  • · Replies 7 ·
Replies
7
Views
2K
Calculating the weight of 1 atomic mass unit
  • · Replies 29 ·
Replies
29
Views
8K
Is AMU the unit for both 'atomic mass' and 'molecular mass'?
  • · Replies 2 ·
Replies
2
Views
2K
'A single molecule of H2O' vs 'a single atom of H2O'
  • · Replies 38 ·
2
Replies
38
Views
6K
The number of atoms in an amount of a substance
  • · Replies 9 ·
Replies
9
Views
2K
Carbon atom larger than a water molecule? Measuring a molecule's size?
  • · Replies 4 ·
Replies
4
Views
6K