## Arithmetic help in chemistry...

ok, i'm trying to get the mass of a calcium atom in kilograms...formula for converting atoms to grams is(1.00amu=1.66x10^-24g)Calcium is 40.1amu
Ok, here is the setup with it..
40.1amu/1 x 1.66x10^-24g/1.00amu x 1kg/1,000g= ...
So how am i suposed to get the answer? Could someone please put the answer our step by step for me? Thanks a bunch[:)]

Andrew
 PhysOrg.com chemistry news on PhysOrg.com >> Scientists make breast cancer advance that turns previous thinking on its head>> Cradle turns smartphone into handheld biosensor>> New filtration material could make petroleum refining cheaper, more efficient
 Recognitions: Science Advisor The main thing is to get the units to work out. 40.1amu * 1.66x10^-24g/amu * 1kg/1000g = 6.6566x10^-26kg The way we did questions like this at my school was like this: 40.08g/mol * 1mol/6.02x10^23atoms * 1kg/1000g = 6.6578x10^-26kg/atom Both ways work but I personally like the second way better. 6.02x10^23 is avogadro's number which is fairly easy to remember since you see it a lot. That 1.66x10^-24 is 1 over avogadro's number which does the same thing in both equations but it just makes it so you need to remember another number (not a good thing).
 Thread Tools

 Similar Threads for: Arithmetic help in chemistry... Thread Forum Replies General Math 10 Calculus & Beyond Homework 2 Biology, Chemistry & Other Homework 1 Introductory Physics Homework 3 General Math 0