Specific charge calculation help

[aurao2003]

Homework Statement

a cu atom (mass number, 63;atomic number, 29) loses 2 electrons formed. for the ion formed calculate its specific charge in c\kg

Homework Equations

specific charge=charge\mass

The Attempt at a Solution

ss
specific charge = (29x1.6x10-19)/(63x1.67x10-27)

i am obtaining 4.41x10^7 while the answer is 3.04x10^6.

please help.

thanks
ben

 

[rl.bhat]

Net charge on the atom is + 2e.

 

[aurao2003]

Net charge on the atom is + 2e.

thanks for your propmt reply. that means my charge will be 3.2x10^-19. however, how do i calculate my mass?

cheers

 

[rl.bhat]

Your mass in the solution is correct.

 

[aurao2003]

Your mass in the solution is correct.

thanks a lot.

regards
ben

 

[lillost]

hey I am new to this site so i really have no idea how this works but I am trying to calculate specific charge as well.. but i still don't understand TT___TT...
please help me :(

 

[rl.bhat]

hey I am new to this site so i really have no idea how this works but I am trying to calculate specific charge as well.. but i still don't understand TT___TT...
please help me :(

Hi lillost, welcome to PF.
Specific charge means charge per unit mass, (e/
Two electrons are removed from the copper atom, So the net charge Q on it is 2*1.6*10^-19 C.
Mass of the copper atom is (63x1.67x10-27)kg.
Now fine the specific charge on copper.

 

[lillost]

aww thank you! ^___^
I'll kinda write down what I am doing and then could you just tell me where i go wrong please?
so then 2 elctrons have the charge : 2(1.60x10-19)
Mass of 63Cu: 63(1.67x10-27)
and specific charge is: charge/mass
so we would have: 2(1.60x10-19)/63(1.67x10-27)
= 3.2x10-19/ 1.0521x10-25
= 3041535.976
= 3.04x10*6?
is that right?? I am soo confused! >____<

 

[rl.bhat]

Your answer is correct.

 

[lillost]

aw thank you very much!
i went through it with my teacher today, i get it now...
ahh took me long enough...=__=
thanks again :D