# What does it mean by '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'?

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

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

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

Borek
Mentor
Can you count the molecules?

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

Borek
Mentor
Yes.

So which part of the

what does it mean by ' the number of particles'?

is not clear?

So which part of the

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

OmCheeto
Borek
Mentor
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.

OmCheeto
Gold Member
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?

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