Answer Happy

Electricity involves some quantity of charge that is measured in units of Coulombs (C). A single electron carries a charge of 1.6 x 10-19 C. How many electrons are needed to form a charge of -75 nC? NOTES: • nC = nano-Coulomb = 1 x 10°C • answer in scientific notation with 2-decimal place precision • format examples: 1.23e+9 = 1.23 x 10° | 4.56e-9 = 4.56 x 109 Round your answer to 2 decimal places. The number of moles nin an elemental sample is just the ratio of the mass m to atomic mass A. M NE А The number of protons n, in an elemental sample is Z (atomic number) times the number of moles n of Avogadro's number N. N = ZnN Copper has an atomic mass of 63.5 g/mole and 29 protons per atom. If such an atom were neutral, then it would have as many protons as electrons. If you remove electrons from a neutral state, then you get a net positive charge. Given a 64 gram ball of copper with a net charge of 2.13 yc, what fraction of the copper's electrons have been removed? Round your answer to 2 decimal places.