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How many moles.....

How many moles of electrons are there in one mole of OH- Ions? I know the answer but not sure how to go about tackling this question.

Reply 1

Hearty_Beast

how many electrons are there in an OH- ion? 10 (I think...)

ratio= 1 OH- : 10 e-

so in 1 mole of OH-, there's 10 moles of e-

Reply 2

syNK

Original post by LegendX

How many moles of electrons are there in one mole of OH- Ions? I know the answer but not sure how to go about tackling this question.

O has 8 electrons so 8 moles
H has 1 electron so 1 mole
the negative sign is +1 electron so another mole which equals 10.

Reply 3

EierVonSatan

Original post by word2yamother

You can only get moles of atoms not moles of subatomic particles

Not true

Moles is just the SI unit for amount, so it can be for atoms, ions, molecules, electrons etc. :smile:

Reply 4

thegodofgod

Original post by word2yamother

You can only get moles of atoms not moles of subatomic particles

You can get moles of H⁺ ions, which are protons :wink:

That's not true.

So basically when it says a question like this, you break it down so for example if it said, how many m,es of electrons in SO4 2- charge, it would be

16 electrons frm sulfur
32 electrons from oxygen
And 2 more cus its 2- ?

But I don't understand why the charge on the ion makes you add electrons.

Reply 7

Hearty_Beast

Original post by LegendX

The -ve charge is due to excess electrons (similarly +ve charge is from a lack of electrons.)

The number of protons doesn't change (otherwise the element would change) but electrons can be lost/gained to give charged ions...

Reply 8

LegendX

Original post by Hearty_Beast

so the moles of electrons in say ' 2 SO4 2- ' would be:

164?

Reply 9

clownfish

Original post by LegendX

so the moles of electrons in say ' 2 SO4 2- ' would be:

164?

S = 16e
Each O = 8e
2- = 2e
SO₄^2- = 16 + (8*4) +2 = 50e

So 2SO₄^2- = 2x50=100e

I think you might have used the mass number of sulfur instead of the atomic number.

Reply 10

LegendX

Original post by Hearty_Beast

in SO42- where did the excess of 2 electrons come from? if the S supplies 16 electrons and the O supplies 32 electrons surely it would be 48 electrons in total and not 50?

Reply 11

EierVonSatan

Original post by LegendX

in SO42- where did the excess of 2 electrons come from? if the S supplies 16 electrons and the O supplies 32 electrons surely it would be 48 electrons in total and not 50?

neutral S provides 16 electrons, neutral O provides 32 electrons

you have a 2- charge on the ion so you have to add 2 more electrons

Reply 12

illusionz

As previously stated, a mole is simply an amount. You could have a mole of moles if you really wanted to. Or a mole of voles if that's more your thing :rolleyes:

Reply 13

anillatoo

Original post by illusionz

As previously stated, a mole is simply an amount. You could have a mole of moles if you really wanted to. Or a mole of voles if that's more your thing :rolleyes:

How many mole of particles are there then in one mole of electrons?

Reply 14

illusionz

Original post by anillatoo

How many mole of particles are there then in one mole of electrons?

Seeing as electrons are elementary particles (leptons), 1.

Reply 15

anillatoo

Original post by illusionz

Seeing as electrons are elementary particles (leptons), 1.

Alright, so if I understood your reasoning, one mole of proton contains 3 moles of quarks which each contains one mole of 6.02*10^23 particles?

Reply 16

illusionz

Original post by anillatoo

Alright, so if I understood your reasoning, one mole of proton contains 3 moles of quarks which each contains one mole of 6.02*10^23 particles?

Well I wouldn't normally think about it in that way - I only brought up elementary particles because your question seemed rather odd. I guess you could argue that each proton contains 3 quarks so therefore a mole of protons contains 3 moles of particles, but it's not something anyone would ever ask.