I have to submit the answer online..it's due in a few hours. This is the only problem I can't get...I don't even know how to begin to solve it. Any help would be appreciated.
By roughly how much does the mass of a copper object change when, upon being stroked with a piece of woolen cloth, it acquires an excess charge of -0.6 µC?
2007-02-20 12:39:06 · 2 answers · asked by oriolesfan2323 4 in Science & Mathematics ➔ Physics
This negative charge means that electrons were added to the copper. How much does .6uC of electrons weigh?
We assume that no copper was lost to the wool and that the copper was not charged to begin with.
More hints:
The mole weight of electrons is about 1/1800 g / mole
and the Faraday constant relates moles to coulombs
2007-02-20 12:53:04 · answer #1 · answered by Roy E 4 · 0⤊ 0⤋
0.6 x 10^-6 C x (1 electron/ 1.6x10-19C) = No. of electrons.
And 1 electron has a mass of 9.11x10^-31 kg. So multiply the number of electrons by the mass of one electron and there is your answer.
2007-02-20 20:44:13 · answer #2 · answered by Dennis H 4 · 0⤊ 0⤋