The mass of a sample is 550 milligrams. Which of the following expresses that mass in kilograms?
A)5.5 × 10 8 kg
B)5.5 × 10 5 kg
C)5.5 × 10 −4 kg
D)5.5 × 10 −6 kg
E)5.5 × 10 −1 kg

Question

Quizplus · Accepted Answer

To convert milligrams to kilograms, we need to divide by 1,000,000 (or move the decimal point 6 places to the left). Therefore, 550 milligrams is equal to 0.00055 kilograms, which can be expressed as 5.5 × 10^(-4) kilograms.

The Mass of a Sample Is 550 Milligrams