Homework Help: chemistry

Posted by manny on Sunday, September 16, 2007 at 2:14pm.

-2.60-

Hi here is a question I am having trouble with. I need help only on part c.
____________________________________________________________________________________________________________________________________________________________

Each time you inhale, you take in about 500 ml (two sigfigs) of air, each millileter of which contains 2.5 x 10^19 moleules. In delivering the Gettysburg Adress, Abraham Lincoln is estimated to have inhaled about 200 times.

a.) How many molecules did Lincoln take in?

My answer: 200 * (500 ml) * (2.5 x 10^19 molecules / 1 ml) =
2.5 x 10^24 molecules

b.) In the entire atmosphere, there are about 1.1 x 10^44 moleules. What fraction of the molecules in the Earth's atmosphere was inhaled by Lincoln at Gettysburg?

My Answer: (2.5 x 10^24)/(1.1 x 10^44)=
2.3 x 10^-20

c.) In the next breath that you take, how many molecules were inhaled by Lincoln at Gettysburg?

***I don't understand what this part of the question is asking for. How do I go about this?

chemistry - Angel, Saturday, August 4, 2012 at 11:29pm
Doing the same problem, and i dont either
chemistry - Anonymous, Tuesday, January 29, 2013 at 10:20pm
I inhaled 500 ml(2.5 x 10^19 molecules/ 1 ml)= 1.25 x 10^22 molecules. in the entire atmosphere Lincoln fractionly inhaled 2.3 x 10^-20 molecules, so 1.25 x 10^22 x 2.3 x 10^-20 = 2.8 x 10^2 approximately.
chemistry - Bruce, Tuesday, January 29, 2013 at 10:22pm
I inhaled 500 ml(2.5 x 10^19 molecules/ 1 ml)= 1.25 x 10^22 molecules. in the entire atmosphere Lincoln fractionly inhaled 2.3 x 10^-20 molecules, so 1.25 x 10^22 x 2.3 x 10^-20 = 2.8 x 10^2 approximately.

Answer this Question

Related Questions

Chemistry - What is the compound name for Sb2(CrO4)5? This is the only question ...
Calculus - I need to solve this equation for P. I've got it partially solved...
re -same question again - sorry to post this question again but i am having ...
Literature - I need to translate some lines of poetry into today's language ...
ACC305 Accounting for Decision Making - I am trying to get my research paper ...
ACC305 Accounting for Decision Making - I am trying to get my research paper ...
math - i am having a hard time with factoring i have read what is here but am ...
CHEMISTRY - I am having a ton of trouble with this lab question, I do not ...
chemistry - I am having a ton of trouble with this lab question, I do not ...
Accounting - I need to make a Bond with discount and I do not know how to and ...

For Further Reading

First Name:
School Subject:
Answer: