avogadros number

[blackeyed]

Avagadros number is defined as the number of particles present in a 12g sample of Carbon-12 .I know that 12 is the molecular mass for carbon so likewise, can i define Avagadros number as the number of particles present in a 32 gram sample of Oxygen?
thanx

[Cheeris]

No.

Two points:
- Oxygen generally has a 'molecular mass' of 16.
- Ask your teacher/tutor to go over it again with you.

[blackeyed]

yeah sorry, i made a mistake over there.So, can i say avagadros number is the number of particles in a 16g sample of oxygen.
thanx for your answer cheeris the mistake was unintentional i've been out of touch with chemistry for almost 4 months now.

[factor-fiction]

Hello Cheeris- II thought the molecular mass of Oxygen ( Oâ‚‚) is 32.

[blackeyed]

what about the answer factor30

[beso]

Atomic number of Oxygen is 8.
99.762% of naturally occuring oxygen is isotope16
Atomic mass of Oxygen16 is 16.
There are also natural isotopes 17 and 18.

Molecular mass of the most common form (diatomic) Oxygen16 is 32.
Cheeris is incorrect.

However the slight difference in bonding energy (and hence mass) between Carbon and Oxygen would result in a very very small error if used for Avogadros number. This is why it is specifically defined by Carbon rather than just any element.

[blackeyed]

thanx beso

[Cheeris]

Cheeris was not only incorrect, he was very very drunk when answering the question!!

Sorry for the stupid error people!

[Cheeris]

Although in my defence, like the Question author (I believe?) I was actually referring to atomic mass, hence my use of the inverted commas to point out the use of an incorrect term.

Of course, I really should have pointed this out rather than just being sarky and snide, so apologies to all concerned - especially blackeyed.

[blackeyed]

you need not worry cheeris no offence was taken
and now thanks to you i will always rememeber that the atomic mass of oxygen is 16 and molecular mass is 32!

[Peter Pedant]

yeah I was reading this, and thinking Christ they are all making a real meal of all this.

Black eye: no answers allowed on your stem cell question.
A. yes, but the stem cells will be specific for the embryo species.
So a pig embryo will yield little piggy stem cells

Good question, raising questions like what happens if you mix stem cells and culture them.
or, get a bunny stem cell and get the nucleus and put it in a piggy stem cell

1959 Lejeune was the first to get a frog liver cell nucleus and put it in a fertilised frog spawn whose nucleus had been irradiated, and got a........?
the answer shocked everyone
and as they say, changed history

[blackeyed]

thanx for your answer PP but i didn't quite get the last paragraph.