physics!

posted by .

A copper wire 81.9 cm long and 1.10 mm in diameter has a mass of 6.43 g.

(a) Find the number of electrons in the wire. (Copper has an atomic number of 29; that is, there are 29 protons in the Copper atom. Copper's atomic mass is 63.5.)
how many electrons:

(b) There is one free electron per atom in copper. Find the number of free electrons in the wire.
how many electrons :

Similar Questions

1. chemistry stoichiometry

My chem teacher gave us this problem Twelve-gauge copper wire,like the kind commonly used in residential electrical systems, is roughly cylindrical and has a diameter of approximately .1040in. Copper's density is 8.92g/cubic cm and …
2. Physics

(1) 45 micro coulombs of charge is passed through a wire in 35 seconds. How many electrons does this represent?
3. physics

Suppose that you wish to fabricate a uniform wire out of 0.900 g of copper. Assume the wire has a resistance R = 0.500 , and all of the copper is used. (a) What will be the length of the wire?
4. Physics

A 14.0 ohm resistor is made from a coil of copper wire whose total mass is 23.0 g. What is the diameter of the wire, and how long is it?
5. physics

A copper wire has a circular cross section with a radius of 3.75 mm. If the wire carries a current of 4.00 A, find the drift speed of the electrons in the wire. (Assume the density of charge carriers (electrons) in a copper wire is …
6. physics

A copper wire has a circular cross section with a radius of 3.75 mm. If the wire carries a current of 4.00 A, find the drift speed of the electrons in the wire. (Assume the density of charge carriers (electrons) in a copper wire is …
7. physics

A copper wire 81.9 cm long and 1.10 mm in diameter has a mass of 6.43 g. (a) Find the number of electrons in the wire. (Copper has an atomic number of 29; that is, there are 29 protons in the Copper atom. Copper's atomic mass is 63.5.) …
8. physics

copper has 8.5 x 10^28 electrons per cubic meter. (a) how many electrons are there in 30 cm length a 12 gauge copper wire (diameter 2.05 mm)?
9. Physics

A current of 4 A flows in a copper wire 10 mm in diameter. The density of valence electrons in copper is roughly 9 × 1028 m−3. Find the drift speed of these electrons. Answer in units of m/s.
10. physics

A copper wire that has a diameter of 2.9 mm carries a current of 39.0 A. Assuming that each copper atom contributes one free electron to the metal, find the drift velocity of the electrons in the wire. The molar mass of copper is 63.5 …

More Similar Questions