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

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Discussion Overview

The discussion revolves around the concept of molar mass and whether it encompasses atomic weight for single atoms as well as molecular weight for molecules. The scope includes conceptual clarification and mathematical reasoning related to the calculation of moles for different entities.

Discussion Character

  • Conceptual clarification, Mathematical reasoning

Main Points Raised

  • Some participants propose that molar mass represents the mass of one mole of any entities, including atoms and molecules.
  • One participant provides an example involving the calculation of moles for water and hydrogen, illustrating the application of molar mass in practical scenarios.
  • Another participant expresses confusion regarding the initial question but ultimately indicates they received an answer.

Areas of Agreement / Disagreement

Participants generally agree on the definition of molar mass as the mass of one mole of entities, but there is some confusion regarding the initial question, which remains unresolved.

Contextual Notes

The discussion includes a specific example of calculating moles, but it does not clarify the relationship between atomic weight and molar mass in detail, leaving some assumptions unaddressed.

HCverma
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Does molar mass include an atomic weight for single atom and molecular weight for molecules?
 
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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...
 
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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.
 

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