A sample of nitrogen in a glass bulb has a mass of 245 mg. What is this mass in kilograms?

(Note: 1,000 mg = 1 g, 1,000 g = 1 kg.)

Answer :

To convert the mass of nitrogen from milligrams to kilograms, you can follow these steps:

1. Understand the conversion factors:
- There are 1,000 milligrams (mg) in a gram (g).
- There are 1,000 grams (g) in a kilogram (kg).

2. Convert milligrams to grams:
- Start with the mass in milligrams: 245 mg.
- Divide by 1,000 to convert to grams:
[tex]\[
\text{Mass in grams} = \frac{245 \text{ mg}}{1,000} = 0.245 \text{ g}
\][/tex]

3. Convert grams to kilograms:
- Take the mass in grams: 0.245 g.
- Divide by 1,000 to convert to kilograms:
[tex]\[
\text{Mass in kilograms} = \frac{0.245 \text{ g}}{1,000} = 0.000245 \text{ kg}
\][/tex]

So, the mass of the nitrogen in kilograms is 0.000245 kg.