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Mon 14 Jan, 2008 03:34 am
What is the total charge on all the electrons in 27.35cm3 of water?
ok 27.35cm^3=27.35 grams, i used it to get the mole of water and then use avo number 6.022e23 to find how much molecules I have in total. Since 1 mole of water contains 10 electrons, and the charge on each electron is 1.602e-19. I got something like 1463731 C, but it's wrong.... anyone wana point out my mistake?
Do it slowly:
27.35x(6.022x10^23)x10x(1.602x10^-19)=?
Include units to check your answer
27.25 (gm^3)*1 (g/cm^3) *1/18 gmole/g *6.023x10^23 (molecules/gmole)*18 (electrons/molecule)*1.620x10^-19(Coulombs/electron)=27.25*1/18*6.023x10^23*18*1.620X10^-19 (Couloumbs)
I have a question---what happened to all of the protrons?
Rap
presumably, they're still there making the net charge of the mass of water roughly zero.
Re: Electrons in Water
englishnewb wrote:Since 1 mole of water contains 10 electrons,
...
anyone wana point out my mistake?
It's not a
mole of water that contains 10 electrons....
ah i forgot, charge of electron is negative...
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