Question

The mass of a sample is 550 milligrams. Which of the following expresses that mass in kilograms?

1) 0.00055 kg
2) 0.0055 kg
3) 0.055 kg
4) 0.55 kg

Answer 1

The mass of 550 milligrams is converted to kilograms by first converting to grams (550 mg = 0.55 g) and then to kilograms (0.55 g = 0.00055 kg), resulting in 0.00055 kilograms.

Step-by-step explanation:

The mass of a sample is 550 milligrams. To express this mass in kilograms, we need to convert milligrams to grams, and then grams to kilograms. Since there are 1,000 milligrams in a gram, and 1,000 grams in a kilogram:

1. First, divide 550 milligrams by 1,000 to get grams: 550 mg / 1,000 = 0.55 g.
2. Then, divide 0.55 grams by 1,000 to get kilograms: 0.55 g / 1,000 = 0.00055 kg.

So, 550 milligrams is equal to 0.00055 kilograms, making option 1) correct.