2007-03-19 09:41:39 · 4 answers · asked by Shawntae G 1 in Science & Mathematics ➔ Chemistry
I guess by the small m it's molal
so that's 1.5 moles ethanols/1 kg solution
C2H5OH MW = 46 g/mole
1.5 moles = 69 g
w/w % = 0.069 kg/kg % 100 = 6.9% w/w% ethanol
2007-03-19 09:50:52 · answer #1 · answered by Dr Dave P 7 · 0⤊ 0⤋
1.5 molar solution means 1.5 moles per liter of solution.
How much does a mole of ethanol weight? Let's get the formula to find out. CH3-CH2-OH.
H6 = 6 g/mol
C2= 12*2 = 24 g/mol
O = 16 g/mol
So ethanol mol weights 46g/mol (addition of all atoms)
So you have 1.5 moles, meaning 46*1.5 = 46+23=69 grams per liter of water.
So the percentage should be (69 grams/1000 grams)*100. This assumes that the density of alcohol is similar to water... and it is to not affect calculation a lot. So percentage is 6.9% ethanol.
IT DOES NOT REQUIRE EINSTEIN! IT IS AN EASY QUESTION!
2007-03-19 16:54:49 · answer #2 · answered by Rudy 2 · 1⤊ 0⤋
There should be a formula in your chem book to figure this out...
2007-03-19 16:44:43 · answer #3 · answered by poohb2878 6 · 0⤊ 0⤋
DO I LOOK LIKE EINSTEIN 2 U?!LOL J/K
2007-03-19 16:44:43 · answer #4 · answered by CUB!Z21 1 · 0⤊ 0⤋