What is the molar mass of a compound if 25.0 g of the compound dissolved in 750. mL gives a molarity of 0.290 M?
回答 (2)
2018-04-04 12:50 pm
No. of moles of the compound = (0.290 mol/L) × (750/1000 L) = 0.218 mol
Molar mass of the compound = (25.0 g) / (0.218 mol) = 115 g/mol (to 3 sig. fig.)
Molar mass of the compound = (25.0 g) / (0.218 mol) = 115 g/mol (to 3 sig. fig.)
2018-04-04 8:35 am
molarity M = n/V
so calculate # mol (n) from M and V
molar mass then = 25.0/n
so calculate # mol (n) from M and V
molar mass then = 25.0/n
收錄日期: 2021-05-01 22:22:27
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20180403234641AA5mJDk