Assume that the smallest mass you can measure on your balance is 1.00 mg. How many molecules would there be in 1.00 mg of a substance that has a molar mass of 100.00 g/mol?
If anyone could give me helpful insight on how I go about this problem it would be most appreciated. I am stumped on how to move on. Thank you!
Chemistry Question: How many molecules would there be in 1.00 mg of a substance that has a molar mass of 100.00 g/mol?
2017-01-29 1:39 am
回答 (2)
2017-01-29 1:55 am
✔ 最佳答案
No. of moles of the molecules= (Mass) / (Molar mass)
= (1.00 mg) / (100.00 g/mol
= (1.00/1000 g) / (100.00 g/mol)
= 0.00001 mol
No. of molecules
= (No. of moles) × (Avogadro constant)
= (0.00001 mol) × (6.02 × 10²³ /mol)
= 6.02 × 10¹⁸
2017-01-29 1:52 am
1.0mg = 0.001g
Mol of substance = 0.001/100.00 = 1.0*10^-5 mol
number of molecules = (1*10^-5) * 6.022*10^23 = 6.022*10^18 molecules.
Mol of substance = 0.001/100.00 = 1.0*10^-5 mol
number of molecules = (1*10^-5) * 6.022*10^23 = 6.022*10^18 molecules.
收錄日期: 2021-04-18 15:58:41
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20170128173951AAbw0Uu