Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
CHEMISTRY HELP- Please see question below?
How many atoms of gold (Au) are in 1.12mg of pure gold?
I don't understand how to do this...
1 Answer
- MTLv 59 years agoFavorite Answer
Firstly, convert 1.12 mg Au to mols = (mass of Au in g) * (molar mass of Au in mol/g)
= (1.12 mg Au)*(1 g Au / 1000 mg Au) * (1 mol Au / 247.98857 g AU)
= 0.000004516 mol Au = 4.156 x 10^-6 mol Au
Note that 1 mol of Au contains 6.022 x 10^23 (Avogadro's number) Au atoms.
So the number Au atoms in 1.12mg of pure gold is:
(4.156 x 10^-6)*(6.022 x 10^23) = 2.50 x 10^18 Au atoms
