A sample of water that is 99.9999% pure contains 0.0001% impurities. Consider from Chapter 1 that a glass of water contains on the order of a trillion trillion (1 × 1024) molecules. If 0.0001% of these molecules were the molecules of some impurity, about how many impurity molecules would this be?
A. 1,000,000,000,000,000,000 (one million trillion: 1 × 1018)
B. 1,000,000 (one million: 1 × 106)
C. 1000 (one thousand: 1 × 103)
D. 1,000,000,000 (one billion: 1 × 109)
Answer: A
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