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
Please Help - Chemistry Question Here - The number of Water Molecules in 333 Grams of AL2(SO4)3 . 19H2O is?
The number of Water Molecules in 333 Grams of AL2(SO4)3 . 19H2O is
A) 18 * 6.022 * 1023
B) 9 * 6.022 * 1023
C) 18
D) 36
1 Answer
- Trevor HLv 77 years agoFavorite Answer
Are you sure about Al2(SO4)3.19H2O. This forms a number of different hydrates, of which the hexadecahydrate Al2(SO4)3•16H2O and octadecahydrate Al2(SO4)3•18H2O are the most common.
Looking at the answer choices, I will work with 18H2O
Molar mass of Al2(SO4)3.18H2O is 666 g/mol
Mol in 333g = 333/666 = 0.5..mol
1 mol Al2(SO4)3.18H2O contains 18 mol H2O
0.500 mol Al2(SO4)3.18H2O contains 18*0.500 = 9.00 mol H2O
1 mol H2O contains 6.022*10^23 molecules
9 mol H2O contains 9*6.022*10^23 molecules H2O
In proper scientific notation this = 5.42*10^24 molecules.
