Simple chemistry problem that I need help with (just need you to see what's wrong)
Favorites|Homepage
Subscriptions | sitemap
HOME > Chemistry > Simple chemistry problem that I need help with (just need you to see what's wrong)

Simple chemistry problem that I need help with (just need you to see what's wrong)

[From: ] [author: ] [Date: 11-06-14] [Hit: ]
33 g sample of C6H6.The number of molecules is 33.4e+21, and there are 12 atoms in each molecule of C6H6.400.8e+21.......
Basically, I have to find the number of atoms in a 4.33 g sample of C6H6.
The number of molecules is 33.4e+21, and there are 12 atoms in each molecule of C6H6. So I just multiply the two to get:
400.8e+21.
Now I have to check my significant figures, and I need to use 2 significant figures, right (because 12 is 2 significant figures and the most uncertain, and I was taught to always use the most uncertain number of significant figures in a calculation)? So it'd be 40e+22... but the website is saying that I'm wrong and it's telling me to check my significant figures? What'd I do?

-
12 is what you would call an "exact" number. This is something like saying 24 hours in one day, or 60 seconds in a minute. You could say there are 24.00 hours in a day or 60.000000 seconds in minute.

There should be 3 significant figures in your answer.


Oh and scientific notation is from 1 to 9.99 .. Maybe that's where you are messing up too.
1
keywords: just,with,need,that,you,Simple,see,what,chemistry,039,problem,wrong,to,help,Simple chemistry problem that I need help with (just need you to see what's wrong)
New
Hot
© 2008-2010 http://www.science-mathematics.com . Program by zplan cms. Theme by wukong .