This solution is
then poured into 2.38 gallons of water. (You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution? Answer in units of M.
A sample of 6.92 grams of NaOH is dissolved into 715 mL of aqueous 0.250 M NaOH (assume no volume change).?
2016-07-31 4:35 pm
回答 (1)
2016-07-31 4:54 pm
✔ 最佳答案
Molar mass of NaOH = (23.0 + 16.0 + 1.0) g/mol
= 40.0 g/mol
Total number of moles of NaOH
= (6.92 g) / (40.0 g/mol) + (0.250 mol/L) × (715/1000 L)
= 0.3518 mol
Total volume of water
= (715/1000 L) + (2.38 gallons) × (4.546 L/gallon)
= 11.53 L
Concentration of the final solution
= (0.3518 mol) / (11.53 L)
= 0.0305 M
收錄日期: 2021-04-18 15:23:23
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160731083551AABMzZ8