Google Answers Logo
View Question
Q: chemistry ( Answered 5 out of 5 stars,   0 Comments )
Subject: chemistry
Category: Science > Chemistry
Asked by: teatea-ga
List Price: $2.00
Posted: 06 Jul 2003 16:03 PDT
Expires: 05 Aug 2003 16:03 PDT
Question ID: 225813
How many atoms are in one mole of NO2?
a. 18.1 X 10 23
b. 2.77 x 10 25
c. 3
d. 46
Subject: Re: chemistry
Answered By: tehuti-ga on 06 Jul 2003 16:19 PDT
Rated:5 out of 5 stars
Hello once more teatea,

The answer to this question is (a) 18.1 x 10/23 atoms. 

If you remember, we have already dealt in a previous question with the
idea that one mole of a substance contains the number of molecules
equivalent to Avogadro's number.

There are a number of estimates for Avogadro's number, the most common
6.022 x 10/23 
for example, see

So, one mole of NO2 will contain 6.022 x 10/23 molecules.  One
molecule of NO2, as evident from its molecular formula, consists of
one atom of nitrogen (N) and two atoms of oxygen (O), making three
atoms altogether.

Therefore, to get the number of atoms in a mole of NO2, we have to
multiply the number of molecules by 3, which means 3 x 6.022 x 10/23,
which equals 18.066 x 10/23.  Rounding up to one decimal place gives
18.1 x 10/23, which is the value quoted in answer (a).
teatea-ga rated this answer:5 out of 5 stars

There are no comments at this time.

Important Disclaimer: Answers and comments provided on Google Answers are general information, and are not intended to substitute for informed professional medical, psychiatric, psychological, tax, legal, investment, accounting, or other professional advice. Google does not endorse, and expressly disclaims liability for any product, manufacturer, distributor, service or service provider mentioned or any opinion expressed in answers or comments. Please read carefully the Google Answers Terms of Service.

If you feel that you have found inappropriate content, please let us know by emailing us at with the question ID listed above. Thank you.
Search Google Answers for
Google Answers  

Google Home - Answers FAQ - Terms of Service - Privacy Policy