The mass of a sample is 550 milligrams. Which of the following expresses that mass in kilograms?
A) 5.5 × 108 kg
B) 5.5 × 105 kg
C) 5.5 × 10-4 kg
D) 5.5 × 10-6 kg
E) 5.5 × 10-1 kg
Answer: C
Chemistry
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