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Unformatted text preview: henry (kah2922) – CH 15a  Elec. Forces & Fields – visscher – (1288) 1 This printout should have 6 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. Due Thursday 11 PM 001 10.0 points A sphere is charged with electrons to 5 × 10 − 6 C. The charge of an electron is 1 . 6 × 10 − 19 C. How many electrons are there on the sphere? Correct answer: 3 . 125 × 10 13 . Explanation: Let : q = 5 × 10 − 6 C and q e = 1 . 6 × 10 − 19 C . The total charge is q = nq e n = q q e = 5 × 10 − 6 C 1 . 6 × 10 − 19 C = 3 . 125 × 10 13 . 002 10.0 points You have 1 . 6 kg of water. One mole of water has a mass of 17 . 9 g / mol and each molecule of water contains 10 electrons since water is H 2 O. What is the total electron charge contained in this volume of water? Correct answer: 8 . 61266 × 10 7 C. Explanation: Let : N A = 6 . 02214 × 10 23 molec / mol , q e = 1 . 6 × 10 − 19 C / electron , m = 1 . 6 kg ,...
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 Spring '09
 LIORBURKO
 Charge, Force, Electric charge, 1.6 kg, 0.37 M, 0.92 m, 0.0179 kg, 17.9 g

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