Calculate the molarity of a solution made of 27 g. of calcium hydroxide and 480 g of ethanol
How do I do this?
2007-05-29 05:37:41 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Calcium hydroxide, also known as slaked lime, is a chemical compound with the chemical formula Ca(OH)2
Molar mass 74.093 g/mol
Ethanol, also known as ethyl alcohol, drinking alcohol or grain alcohol, is a flammable, colorless, slightly toxic chemical compound with a distinctive perfume-like odor, and is best known as the alcohol found in alcoholic beverages. C2H6O.
Molar mass 46.06844 g/mol
Density and phase 0.789 g/cm³, liquid
(27 g) / (74.09300 (g / mol)) = 0.364406894 moles
(480 g) / (0.789 (g / (cm^3))) = 0.608365019 liters
(0.364406894 moles) / (0.608365019 liters) = 0.598993832 moles / liter
2007-05-29 05:45:40 · answer #1 · answered by DanE 7 · 2⤊ 0⤋
Molar mass of Ca(OH)2 = 74
Molar mass of C2H5OH = 46 g
Molarity = (27/74)/(480/46) = 0.0349662162 M
2007-05-29 13:30:37 · answer #2 · answered by ag_iitkgp 7 · 1⤊ 0⤋
To get Molarity we have to know :
moles solute and liter of solution.
moles solute = 27 / molar mass Ca(OH)2 = 27 /74 = 0.365
If we don't know the density of the solution we can not get L
if you need molality
m = moles / Kg = 0.365 / 0.480 = 0.760
2007-05-29 12:45:54 · answer #3 · answered by Non più attiva su answers 7 · 0⤊ 2⤋