What does it mean by 'number of particles in a substance'?

In summary, the conversation discusses how to find the number of particles in a substance using the equation N = n × NA, where N is the number of particles, n is the amount of substance in moles, and NA is Avogadro's number. The conversation also touches on the concept of counting particles, such as atoms, molecules, and ions, and how it relates to the concept of counting physical objects, like cars. The main focus is on understanding the meaning and calculation of the number of particles in a substance.
  • #1
HCverma
82
2

Homework Statement


If, N = n × NA
Where N = Number of particles in the substance
and n = Amount of substance in moles (mol)
and NA = Avogadro Number = 6.022 × 1023 particles mol-1
To find the number of particles, N, in a substance: N = n × NA
To find the moles, n, of substance, n = N ÷ NA

Homework Equations

The Attempt at a Solution


As I know mole = given mas / atomic or molecular mass of that entities. so, n = w / M
If n = N / NA, then what does it mean by ' the number of particles'?
 
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  • #2
How is "five cars" conceptually different from "ten molecules"?
 
  • #3
Borek said:
How is "five cars" conceptually different from "ten molecules"?
'Five cars' is a different thing and 'ten molecules' is a different thing. But both of them denote the numbers.
 
Last edited:
  • #4
Conceptually in both cases you have a number of objects. Where is the problem with counting the molecules?
 
  • #5
Borek said:
Conceptually in both cases you have a number of objects. Where is the problem with counting the molecules?
Could you clarify your question, please?
 
  • #6
Can you count the molecules?
 
  • #7
Borek said:
Can you count the molecules?
Yes.
6.023 x 10^23 molecules of any objects make 1 mole of that object.
 
  • #8
HCverma said:
Yes.

So which part of the

HCverma said:
what does it mean by ' the number of particles'?

is not clear?
 
  • #9
Borek said:
So which part of the
is not clear?
Particles mean atoms, molecules, ions.
 
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  • #10
I still fail to see where the problem is. You do know which ones you count when you are counting? You can have mole of atoms, mole of molecules, mole of ions - in general we refer to them as to "mole of substance", no matter what they exactly are. In each case it means you counted some objects, no matter what they are.

In general you can have a mole of cars, why not.
 
  • #11
HCverma said:
what does it mean by ' the number of particles'?
...
Particles mean atoms, molecules, ions.

x particles = x atoms
x particles = x molecules
x particles = x ions

"x" = "the number of"

It's as simple as that. And no more.

ps. I saw your other thread yesterday, and decided that you seem to think "mathematically", and have trouble with "wordy answers". I can totally relate with that.
pps. Did you ever figure that one out?
 
  • #12
OmCheeto said:
x particles = x atoms
x particles = x molecules
x particles = x ions

"x" = "the number of"

It's as simple as that. And no more.

ps. I saw your other thread yesterday, and decided that you seem to think "mathematically", and have trouble with "wordy answers". I can totally relate with that.
pps. Did you ever figure that one out?
Yes.
 
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Likes OmCheeto

FAQ: What does it mean by 'number of particles in a substance'?

What is considered a "particle" in a substance?

A particle in a substance refers to the smallest unit of matter that retains the chemical properties of that substance. This can include atoms, molecules, and ions.

How is the number of particles in a substance determined?

The number of particles in a substance is determined by its molar mass and Avogadro's number. Molar mass is the mass of one mole of a substance, while Avogadro's number is the number of particles in one mole. To find the number of particles, you would divide the substance's mass by its molar mass and then multiply by Avogadro's number.

Does the number of particles in a substance change?

The number of particles in a substance remains constant unless a chemical reaction occurs. In a chemical reaction, the number of particles may change as new substances are formed.

How does temperature affect the number of particles in a substance?

Temperature can affect the number of particles in a substance in two ways. First, as temperature increases, the particles in a substance gain energy and may move faster, causing the substance to expand. Second, increasing the temperature can also cause some substances to undergo a phase change, such as melting or vaporizing, which would change the number of particles in the substance.

Is the number of particles in a substance the same as its mass?

No, the number of particles in a substance is not the same as its mass. The mass of a substance is a measure of the amount of matter present, while the number of particles is a measure of the number of individual units of that substance. These two measurements are related through the substance's molar mass, but they are not interchangeable.

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