The mass of a sample of sodium bicarbonate is 2.1 kilograms (kg). There are 1,000 grams (g) in 1 kg, and 1 mc020-1.jpg 109 nanograms (ng) in 1 g. What is the mass of this sample in ng?

Question

The mass of a sample of sodium bicarbonate is 2.1 kilograms (kg). There are 1,000 grams (g) in 1 kg, and 1  mc020-1.jpg 109 nanograms (ng) in 1 g. What is the mass of this sample in ng?

photon336 · Answer

Do you know how to use dimensional analysis?

photon336 · Answer

2.1 kg x (1000g/kg) = 2.1x10^3 g x (10^9ng/1g) = 2.1x10^12. ng

You always want to ensure that you multiply the number You have by a conversion factor ensuring that the unit you want to get is in the numerator. In this case If you notice we convert kilograms to grams, that kilograms cancel out and we are left with grams.