Calculate within a factor of 100 the number Steve Gibbs Saylor Measurement

Question 45 / 45: Calculate (within a factor of 100) the number of water molecules in a fully grown human being. The mass of one water molecule is approximately 3 x 10^-23 g and a human being may be considered to be 70% water.

A $$10^{15}$$

B $$10^{20}$$

C $$10^{18}$$

D $$10^{27}$$

E $$10^{23}$$

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Explanation:

100 kg x 0.7 x 1000 g/kg x 1 mol/3x10^-23 g = 2x10²⁷

You may do this calculation in your head by just keeping track of the exponents.

Also, make sure that the units cancel appropriately in your expression for the final answer.

Quiz Home Page

https://www.jobilize.com/measurement-experimentation-lab-mcq-quiz-by-dr-steve-gibbs

Measurement & Experimentation Laboratory ME301

Author:

Dr.Steve GibbsProfessor

The Saylor Foundation

USA

Access: Public Instant Grading

Attribution: Dr. Steve Gibbs. Measurement & Experimentation Laboratory. The Saylor Academy 2014, http://www.saylor.org/courses/me301/

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