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

• HCverma
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.

## 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

## 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'?

How is "five cars" conceptually different from "ten molecules"?

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.

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Conceptually in both cases you have a number of objects. Where is the problem with counting the molecules?

Borek said:
Conceptually in both cases you have a number of objects. Where is the problem with counting the molecules?

Can you count the molecules?

Borek said:
Can you count the molecules?
Yes.
6.023 x 10^23 molecules of any objects make 1 mole of that object.

HCverma said:
Yes.

So which part of the

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

is not clear?

Borek said:
So which part of the

is not clear?
Particles mean atoms, molecules, ions.

• OmCheeto
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.

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?

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.

• OmCheeto