The mass of a sample of sodium bicarbonate is 2.1 kilograms (kg). There are 1,000 grams (g) in 1 kg, and 1 Times. 109 nanograms (ng) in 1 g. What is the mass of this sample in ng?
2.1 Times. 103 ng
2.1 Times. 106 ng
2.1 Times. 109 ng
2.1 Times. 1012 ng

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