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What is the volume of ethyl alcohol (den...

What is the volume of ethyl alcohol (density 1.15 g/cc) that has to be added to prepare 100 cc of 0.5 M ethyl alcohol solution in water ?

Text Solution

Verified by Experts

Molarity of solution (M) = `(("Mass of ethyl alcohol")/("Molar mass"))/("Volume of solution in dm"^(3))`
`(0.5 "mol dm"^(-3))=("Mass of ethyl alcohol")/((46" g mol"^(-1))xx(0.1 "dm"^(3)))`
Mass of ethyl alcohol `(C_(2)H_(5)OH)=(0.5 "mol dm"^(-3))xx(46 "g mol"^(-1))xx(0.1 "dm"^(3))`
Volume of ethyl alcohol solution `= ("Mass")/("Density")=((2.3 g))/((1.15 "g/cc"))=2.0` cc.
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