charge = 1.2 * 10^-9 C
charge on 1 electron = 1.6*10^-19 C
number of electron = (1.2*10^-9)/(1.6*10^-19)
= 7.5*10^9
P. A copper penny has a mass of 2.5 g. Suppose it has a net charge...
A 52.8 g ball of copper has a net charge of 2.7 µC. What fraction of the copper's electrons have been removed? (Each copper atom has 29 protons, and copper has an atomic mass of 63.5.) What is the charge on the sphere contributed by protons? How many total protons are there?
A copper penny has a mass of 2.2 g. Determine the energy (in Mev) that would be required to break all the copper nuclei into their constituent protons and neutrons. Ignore the energy that binds the electrons to the nucleus and the energy that binds one atom to another in the structure of the metal. For simplicity, assume that all the copper nuclei are 29 Cu (atomic mass = 62.939 598 u). Energy required = Number Units the tolerance is...
A 25-g copper penny is given a charge of-4.0 penny? 10-9 C. How many excess electrons are on the x 9.426 x 1010 electrons 4.296 x 1010 clectrons 2. 496 x 1010 electrons 1.946 x 1010 electrons Question 2 (12.5 points) atomic nucleus are typically 10-15 m apart. What is the electric force of repulsion between Protons in a nuclear protons? 320.7 N 430.7 N 230.7 N 130.7 N
A single penny has a mass of 6.64 g. How many moles of copper do they contain?
A modern penny weighs 2.5 g but contains only 0.063 g copper (Cu). How many atoms are present in a modern penny?
A penny has a mass of 2.5 g. How many pennies would it take to equal the mass of the earth? Assume the earth is a sphere with a radius of 3678 km and has a density of 5.51 g/cm3. (The volume of a sphere is 4 ir 3 .)
5 Number of electrons Copper consists of atoms that each have 29 electrons and mass 1.06 x 10-25 kg. Copper has a density of 8.69 kg/m3 mo. Assume that the copper is electrically neutral. b) Suppose that electrons are removed from the copper so that it has a net charge of 5.0 x 10-9 C (this is a typical number for capacitors in electronic circuits). Determine the number of electrons that have been removed. c) What fraction of the total...
A 2.5 gram penny is given a charge of -4.0 *10^-9 c. How many excess electrons are on the penny?
A 68.0-g piece of aluminum has a net charge of +4.40 HC. Aluminum has an atomic mass of 27.0 g/mol, and its atomic number is 13. (a) Calculate the number of electrons that were removed from the initially neutral aluminum to produce this charge. 2.75e13electrons (b) Determine what fraction of the original number of electrons this removed number represents Nost Ntotal (c) By how much did the original mass of the aluminum decrease after charging? kg Need Help?RWatch
How much electric charge does the electrons total in a penny dollar (material of the coin - copper and approximate mass 3.0 grams)?