Which of the following has the smallest mass?

Question

Quizplus · Accepted Answer

To compare the masses, we need to convert all the units to a single unit. One commonly used unit for mass is grams (g).

A) 4.0 × 10^-6 g = 0.000004 g 
B) 4.0 × 10^19 ng = 4.0 × 10^10 g 
C) 4.0 × 10^-12 μg = 0.000000000004 g 
D) 4.0 × 10^-3 kg = 4 g 
E) 4.0 × 10^-6 mm is a unit of length and cannot be directly compared to mass units like g.

Therefore, the smallest mass is 0.000000000004 g or 4.0 × 10^-12 μg, which is the mass in choice C.

Which of the Following Has the Smallest Mass