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ing Heading2 Iitle Sub Paragraph Styles QUESTION 20 A copper ore consisting of 12.S% copper(II) sulfide, when heated and reacted with oxygen gas, produces copper(II) oxide and sulfur dioxide. If the reaction has a 90.0% yield, how many grams of copper(II) oxide are produced when 1.00 kg of the copper ore is processed? c a150 g 1. b.116g C c 104 g ce. 749 g 2.5 points QUESTION 21 Atiny speck (2.0×10+ g) of radioactive americium-241 (241.06 g/mojis used in smoke detectors. How many atoms of americium-241 are there in one of these smoke detectors? 1. a 2.9 x 102 atoms b.6.0 x 1023 atoms c 1.2 x 100 atoms 8.3 107 atoms e, e, 5.0 × 1017 atoms 凸(Ctrl-
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