Question

HELP PLEASEE!!

The average mass of a certain type of microorganism is 2.4 x 10^-6 grams. What is the approximate total mass of 5,000 of these microorganisms?

a. 0.12g

b. 0.0012g

c. 0.012g

d. 0.00012g

Answer 1

c. 0.012 g

Explanation:

You want the mass of 5000 microorganisms when their average mass is 2.4 µg.

Total mass

The total mass is found by multiplying the number of organisms by their average mass:

5000 × 2.4·10^-6 = 0.012 . . . . . . grams

The approximate total mass is 0.012 g, choice C.

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Additional comment

"Micro" (µ) is the SI prefix meaning 10^-6.

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