CHEMISTRY HELP! ASAP!?
How many molecules of aspirin contain 2.86 grams of hydrogen?
Explanation on how to do this?
Please and thanks.
- Anonymous8 years agoFavorite Answer
You need the chemical formula of Aspirin.
Now you need the molar mass. http://www.ptable.com/
C9H8O4 = 180.1 g/mol
H = 1g/mol
You have 8H in the molecule, so now it's division.
8/180.1 = 0.0444 x 100 = 4.44% of aspirin is H (this is mass%)
2.86g H (1mol ASA/8g H)(6.022e23 molecules/1mol) = molecules ASA, because everything else cancels.
math: 2.86*6.022e23/8 = 2.153e23 molecules ASA
Hope this helps! :)