Charged Aluminum Spheres: Determining Number of Electrons

[Badger]

[SOLVED] Charged Aluminum Spheres

Homework Statement

Two small aluminum spheres, each of mass 0.0250 kilograms, are separated by 80.0 centimeters.

How many electrons does each sphere contain? (The atomic mass of aluminum is 26.982 grams per mole, and its atomic number is 13.)

Homework Equations

Conversions from a chemistry course so long ago...

The Attempt at a Solution

.0250 kg * (1000g/1kg) = 25.0 g * (1 mole/26.982g) = .927 mole * (13 e- / mol) = 12 e-

 

[learningphysics]

13 electrons/atom... not 13 electrons/mole.

 

[Badger]

Nevermind, figured it out. ;)