A copper atom has 29 protons and a neutral ball of copper has one electron per proton. Copper has an atomic mass of 63.5 unified atomic mass units. A unified atomic mass units is equivalent to g.
How many electrons would be contained in a neutral copper ball with a mass of 50.0 g?
A copper ball with a mass of 50.0 g has a net charge of +2.00 µC. What percent of the electrons in the copper ball have been removed?
A copper penny of mass 2.500 g is given a net charge of C.
The charge of an electron is C.
How many excess electrons are on the penny?
By what percent do the excess electrons change the mass of the penny?
Determine how many coulombs of positive charge are contained in a lump of pure plutonium with a mass of 4.00 kg. Use a value of 244 g/mol for the atomic mass of plutonium and recall that the plutonium has an atomic number of 94.