更新1:
10^23*
A platinum ring is composed of 2.65 × 1023 atoms. Calculate the mass of the ring in grams.?
回答 (2)
2017-09-25 9:13 pm
Number of moles of Pt atoms = (2.65 × 10²³) / (6.022 × 10²³ /mol) = 0.440 mol
Molar mass of Pt = 195.1 g/mol
Mass of Pt = (0.440 mol) × (195.1 g/mol) = 85.8 g
(to 3 sig. fig.)
Molar mass of Pt = 195.1 g/mol
Mass of Pt = (0.440 mol) × (195.1 g/mol) = 85.8 g
(to 3 sig. fig.)
2017-09-25 9:13 pm
1 mole of platinum atoms weighs 195.084 grams.
2.65 x 10^23 atoms = 0.440 moles.
So the mass is
(0.440 mol)(195.084 g/mol) = 85.8 g
2.65 x 10^23 atoms = 0.440 moles.
So the mass is
(0.440 mol)(195.084 g/mol) = 85.8 g
收錄日期: 2021-04-24 00:42:40
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20170925130454AAoVKsS