A sample of concentrated sulphuric acid has a density of 1.83 g/cm and contains 94.0% of sulphuric acid by mass. What is the concentration of sulphuric acid in the sample? pls explain the question and show me the answer.
2007-02-11 12:17:10 · 3 個解答 · 發問者 Ned 2 in 科學 ➔ 化學
the uint of 1.83 should be g/cm3, not g/cm
2007-02-11 12:50:44 · update #1
Consider 1 dm3 (1000 cm3) of the conc. H2SO4.
Total mass = volume x density = 1000 x 1.83 = 1830 g
Mass of H2SO4 = total mass x percentage = 1830 x 94% = 1720 g
Molar mass of H2SO4 = 1x2 + 32.1 + 16x4 = 98.1 g mol-1
No. of moles of H2SO4 = mass / (molar mass) = 1720 / 98.1 = 17.5 mol
Concentration of H2SO4 = mol / volume = 17.5 / 1 = 17.5 mol dm-3
2007-02-11 17:49:16 · answer #1 · answered by Uncle Michael 7 · 0⤊ 0⤋
good ans.
2007-02-16 05:19:41 · answer #2 · answered by 大海水 3 · 0⤊ 0⤋
何謂 1.83 g/cm ？
這可不是一個單位．．． 有沒有打錯題目？
2007-02-11 12:34:25 · answer #3 · answered by ? 2 · 0⤊ 0⤋