What is the empirical formula for the compound?
How to you get Ar2O5 subscripts.
A compound contains arsenic and oxygen as its only elements. A 1.626 g sample of the compound contains 1.060 g of arsenic.?
2017-10-01 1:53 pm
回答 (1)
2017-10-01 2:07 pm
Molar mass of As = 74.92 g/mol
Molar mass of O = 16.00 g/mol
In 1.626 g of the compound:
Number of moles of As = (1.060 g) / (74.92 g/mol) = 0.01415 mol
Number of moles of O = (1.626 - 1.060 g) / (16.00 g/mol) = 0.03538 mol
Mole ratio As : 0
= 0.01415 : 0.03538
= 0.01415/0.1415 : 0.03538/0.1415
= 1 : 2.5
= 2 : 5
Hence, empirical formula = As₂O₅
Molar mass of O = 16.00 g/mol
In 1.626 g of the compound:
Number of moles of As = (1.060 g) / (74.92 g/mol) = 0.01415 mol
Number of moles of O = (1.626 - 1.060 g) / (16.00 g/mol) = 0.03538 mol
Mole ratio As : 0
= 0.01415 : 0.03538
= 0.01415/0.1415 : 0.03538/0.1415
= 1 : 2.5
= 2 : 5
Hence, empirical formula = As₂O₅
收錄日期: 2021-05-01 13:46:55
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20171001055358AAgJljv